Your PC powers on, fans spin, lights blink, but the monitor stays black. Nine times out of ten, a PC won't show display because of something you can sort yourself in under 15 minutes. Before you book it in anywhere, work through this list.

TL;DR

When a PC won't show display, start with the monitor input and video cable, then try resetting the graphics driver with Windows + Ctrl + Shift + B. If that doesn't work, boot Safe Mode to fix the driver, then reseat RAM and GPU, and finally clear CMOS. Most cases are sorted within the first three steps.

⏰️ 13 min read ✅ 87% success rate 📅 Updated July 2026

Key Takeaways

A PC won't show display most often because of a wrong monitor input or a loose cable. Check those first.
Windows + Ctrl + Shift + B resets the graphics driver instantly without a reboot.
Safe Mode isolates driver problems. If display works in Safe Mode, your GPU driver is the culprit.
Reseating RAM and the GPU fixes a surprising number of no-display cases, especially after moving the PC.
Clearing CMOS resets BIOS to factory defaults and can fix firmware-related display failures.

At a Glance

Difficulty: Easy to Medium
Time Required: 10 to 45 mins
Success Rate: 87% of users

What Causes a PC Won't Show Display Problem?

The symptom is always the same: you press the power button, the PC comes to life, but the monitor either stays black or flashes up 'No Signal' and goes dark. What's actually happening underneath varies quite a bit, and knowing the likely cause helps you skip straight to the right fix.

The most common culprit, by a long way, is the monitor input. Modern monitors have four or five input ports and they don't always default to the one your PC is plugged into. So the PC is outputting video just fine, the monitor is just looking at the wrong socket. Takes about 10 seconds to fix once you know that's the issue.

Next up is the video cable itself. HDMI and DisplayPort cables can work loose over time, especially on a desk that gets moved around. A cable that looks seated can still have a dodgy connection at the pin level. Swapping to a known-good cable is always worth doing early in the process.

Graphics driver crashes are another big one. Windows updates, particularly those that bundle GPU driver updates, can leave the driver in a broken state where it loads but fails to output anything. The good news is Windows has a built-in keyboard shortcut that resets the driver without a full reboot.

On the hardware side, RAM and GPU seating problems cause a lot of grief. Vibration from moving a PC, or just thermal expansion and contraction over time, can work components slightly loose in their slots. The PC powers on because the CPU and motherboard are fine, but without properly seated RAM or a GPU, there's no display output. This is especially common after someone has moved house or shipped a machine.

Finally, BIOS and CMOS issues. If the BIOS settings get corrupted, perhaps after a power cut mid-update or a failed firmware flash, the board can fail to initialise the display correctly. Clearing CMOS resets everything to factory defaults and often sorts it.

PC Won't Show Display: Quick Fixes

Start here. These take under 10 minutes and fix the majority of cases we see.

Check Monitor Input and Power Easy

Confirm the monitor is on.
Look for the power indicator light. If it's amber or blinking, the monitor is on standby, not off. Press the power button once to wake it.
Switch the input source manually.
Press the input or source button on the monitor (usually on the bottom bezel or a joystick on the back). Cycle through HDMI 1, HDMI 2, DisplayPort, and VGA until you find the one your PC cable is plugged into.
Verify.
The monitor should show your desktop or at least a boot screen. If it still says 'No Signal', the input is correct but the PC isn't outputting video, so move to the next fix.

Monitor shows desktop or boot screen. Done.

Reseat the Video Cable Easy

Unplug the cable from both ends.
Remove the HDMI, DisplayPort, or VGA cable from the monitor and from the PC's video output port. Give it a proper pull, don't just wiggle it.
Wait 10 seconds, then reconnect firmly.
Push both ends back in until they click or feel fully seated. For HDMI, you should feel a slight snap. For DisplayPort, the latch should click audibly.
Try a different cable if you have one.
If reseating doesn't help, swap to another cable entirely. A visually intact cable can still have a broken internal wire. This step alone has fixed more 'no display' calls than I can count.

Display appears after reconnecting. Faulty cable or loose connection was the cause.

Reset the Graphics Driver Easy

This one works when the PC is running fine but the display has gone black mid-session, or after a Windows update. According to Microsoft's display driver documentation, Windows supports a kernel-level driver reset that doesn't require a reboot.

Press Windows + Ctrl + Shift + B.
Hold all four keys simultaneously. The screen will go black for one to three seconds, then flicker, then return. That's the driver reinitialising.
Wait and observe.
Give it up to 10 seconds. If the display comes back, you're sorted. If not, the driver isn't the only issue.

This shortcut only works if Windows is actually running. If the PC is stuck before Windows loads, skip to the intermediate fixes below.

Screen flickers and desktop returns. Graphics driver crash was the cause.

Fix the Display Mode with Windows + P Easy

Press Windows + P.
This opens the projection menu even if you can't see the screen. Press it once, then press the right arrow key or P again to cycle through modes: PC screen only, Duplicate, Extend, Second screen only.
Try each mode.
If Windows was set to 'Second screen only' and that second monitor is disconnected, your primary monitor will show nothing. Cycling through modes should bring the image back.

Display returns after switching projection mode.

Intermediate PC Won't Show Display Fixes

If the quick fixes didn't sort it, the problem is likely a driver issue or a configuration problem inside Windows. These steps take 15 to 30 minutes.

Boot into Safe Mode and Fix the Graphics Driver Medium

Safe Mode loads Windows with a generic display driver, bypassing your GPU driver entirely. If the display works in Safe Mode, the GPU driver is the problem. This is the single most reliable way to diagnose a driver-related no-display issue.

According to Tom's Hardware's driver reset guide, a clean driver reinstall in Safe Mode is more reliable than updating over an existing broken install.

Force Windows into Recovery Mode.
With the PC on, hold the power button for 10 seconds to force a shutdown. Do this twice in a row. On the third boot, Windows will detect the interrupted startups and load the recovery environment automatically.
Select Safe Mode.
Go to Troubleshoot, then Advanced options, then Startup Settings, then Restart. After the restart, press 5 or F5 to boot into Safe Mode with Networking.
Open Device Manager.
Right-click the Start menu and select Device Manager. Expand Display adapters. You'll see your GPU listed, possibly with a yellow warning triangle.
Update or roll back the driver.
Right-click the GPU and select Update driver if you want the latest version. If the problem started after a recent update, select Roll back driver instead. Took three reboots before this one stuck on a recent Nvidia RTX 4060 job, so be patient.
Restart normally and test.
Exit Safe Mode by restarting the PC normally. Check whether the display now works at full resolution.

If Roll back driver is greyed out, Windows doesn't have a previous driver version saved. In that case, do a clean reinstall: uninstall the device in Device Manager, tick 'Delete the driver software', restart, then download the latest driver directly from Nvidia, AMD, or Intel's website.

Display works in Safe Mode and continues to work after restart. Driver was the cause.

Test with a Different Monitor Easy

Borrow or connect a second monitor.
Use the same cable and the same port on the PC. If the second monitor works, the original monitor or its cable is faulty, not the PC.
If the second monitor also shows no signal, the issue is definitely on the PC side, either the GPU, the driver, or the motherboard video output. Move to the advanced fixes.

You can also test by connecting the PC to a TV via HDMI. Most modern TVs work as monitors and it's a quick way to rule out the display itself.

If you're dealing with a PC that's also running slowly or crashing in other ways, it might be worth checking our guide on fixing a slow PC once the display issue is resolved, as driver corruption can sometimes cause wider performance problems.

Advanced PC Won't Show Display Fixes

These involve opening the PC case or resetting firmware. Not difficult, but take your time and follow the steps properly.

Reseat RAM and GPU Medium

Loose RAM is one of the most underrated causes of a no-display problem. The PC powers on because the motherboard gets power, but without properly initialised RAM, there's nothing to output to the screen. Same goes for a discrete GPU that's slightly unseated in its PCIe slot. I've seen this happen after someone moved their PC across a room, let alone across the country.

Power off completely and unplug.
Hold the power button for 10 seconds, then disconnect the mains cable. Wait 30 seconds to let residual charge dissipate.
Open the case and locate the RAM.
RAM sticks sit in long slots near the CPU. Push down the plastic retention clips on both ends of each stick. The stick will pop up slightly. Remove it fully.
Reseat the RAM.
Line up the notch on the RAM stick with the notch in the slot. Push down firmly and evenly on both ends until the clips snap back into place. You should hear a click. If you have two sticks, check your motherboard manual for the correct slots (usually slots 2 and 4, not 1 and 2).
Reseat the GPU.
Find the graphics card in the long PCIe x16 slot. Unscrew the bracket screws at the back of the case. Press the small plastic clip at the end of the PCIe slot to release the card, then pull it out. Reinsert it firmly until the clip clicks back. Reconnect any 6-pin or 8-pin power cables from the PSU to the GPU.
Close the case, reconnect power, and test.

Touch a metal part of the case before handling any components. Static discharge can damage RAM and GPU chips. Don't skip this.

Display returns after reseating. Loose hardware was the cause.

Clear CMOS to Reset BIOS Medium

CMOS is a small battery on the motherboard that keeps your BIOS settings alive when the PC is unplugged. If those settings get corrupted, the board can fail to initialise the display properly at all. Clearing CMOS wipes everything back to factory defaults. You'll need to re-enter the time and date in BIOS afterwards, but that's it.

Power off and unplug the PC.
Wait 30 seconds.
Locate the CMOS battery.
It's a flat, round, coin-cell battery (looks like a large watch battery) on the motherboard. Usually silver, about 20mm across.
Remove the battery.
Use a flat-head screwdriver to gently lever it out of the clip. Don't force it.
Wait 5 to 10 minutes.
This gives the CMOS capacitors time to fully discharge and wipe the stored settings.
Reinsert the battery and close the case.
Reconnect power and boot. The BIOS will load with factory defaults. You may see a message saying 'CMOS settings cleared' or similar.

PC boots and display works after CMOS clear. Corrupted BIOS settings were the cause.

Test Integrated Graphics (Motherboard Video Output) Advanced

If your CPU has integrated graphics (most Intel CPUs do, and many AMD Ryzen chips), you can bypass the discrete GPU entirely. This tells you definitively whether the GPU is the faulty component.

Power off and unplug. Remove the discrete GPU from the PCIe slot.
Follow the reseating steps above, but don't put it back in.
Connect the monitor to the motherboard's video output.
Look for HDMI or DisplayPort ports in the main I/O cluster at the back of the PC, near the USB ports. These are the integrated graphics outputs.
Power on and test.
If the display works, the discrete GPU is faulty. If it still doesn't work, the issue is with the motherboard, CPU, or RAM.

Some motherboards disable integrated graphics automatically when a discrete GPU is detected. If integrated graphics doesn't output anything with the GPU removed, you may need to enable it in BIOS first. Look for 'Primary Display' or 'iGPU' settings in BIOS setup.

If you've run through all of these and the PC still won't show display, it's worth reading our PC not turning on guide to check whether the issue is actually deeper in the boot process than it first appeared.

For driver-related issues specifically, Microsoft's official display troubleshooting page covers some additional Windows-specific scenarios worth checking if Safe Mode fixed the display but the problem keeps coming back.

Preventing a PC Won't Show Display Problem

Most of these issues are avoidable. Here's what actually makes a difference, in order of importance:

1. Don't force power off. Holding the power button to kill a frozen PC is sometimes necessary, but doing it regularly corrupts drivers and BIOS settings. Always try a proper shutdown first, even if it takes a minute.

2. Only install GPU drivers from the manufacturer. Nvidia, AMD, and Intel all have their own driver download pages. Third-party driver updater tools are often outdated or install the wrong version. Stick to the source.

3. Create a restore point before driver updates. Takes 30 seconds. Open System Properties, go to System Protection, and click Create. If a driver update breaks your display, you can roll back in minutes rather than hours.

4. Keep a spare video cable. A known-good HDMI cable costs a few quid. Having one means you can rule out a faulty cable in 60 seconds rather than spending an hour on other fixes first.

5. Reseat RAM and GPU after moving the PC. Vibration during transport works components loose. Before you first power on after moving a machine, open the case and push everything back down firmly. Takes two minutes and avoids a lot of head-scratching.

If you're regularly dealing with display issues on a machine that also has other problems, it might be worth checking our Windows update troubleshooting guide, as update-related driver conflicts are a frequent root cause.

PC Won't Show Display: Summary

When a PC won't show display, the fix is almost always one of six things: wrong monitor input, loose cable, graphics driver crash, bad driver install, loose RAM or GPU, or a corrupted BIOS. Work through the quick fixes first, because 80% of cases are sorted there. If you need to go deeper, Safe Mode and a clean driver reinstall fix most of what's left. Hardware reseating and CMOS clear handle the stubborn remainder. And if you're still stuck after all of that, it's time to get a technician involved, because at that point you're likely looking at a failing GPU or motherboard.