Why does my second monitor stay black after my PC wakes from sleep?

Multi-monitor setups are especially prone to signal handshake failures after sleep. Try setting both monitors to the same refresh rate and resolution, and make sure each cable is seated firmly. If one monitor is connected through a hub or adapter, try a direct connection instead.

Will a factory reset fix a black screen after sleep?

Rarely, and it is almost never worth trying before you have ruled out drivers and power settings. A clean driver install using DDU does most of what a reset would accomplish for display-related issues, without wiping your files.

Could a failing power supply cause a black screen after sleep?

Yes, though it is less common than driver or software causes. A PSU that is marginal under load may deliver enough power at idle but stumble when the system ramps back up from sleep. If your PC is several years old and the black screen is accompanied by instability under load, the PSU is worth investigating.

Does this happen on laptops too?

Yes, and on laptops the cause is often the same: a driver crash or aggressive power management cutting the display link. The additional wrinkle on laptops is a failing display cable or a loose connection between the lid and the chassis, which can mimic a driver problem exactly.

PC Boots to Black Screen After Sleep: What Is Actually Wrong

TL;DR: A black screen after sleep is usually caused by a bad graphics driver, a botched fast startup setting, or a monitor that lost its signal handshake. Work through the steps below in order. Most cases are fixable without touching hardware. A few require a shop visit.

What you need

A keyboard and mouse (working)
Access to Windows Settings and Device Manager
About 20-30 minutes
A second monitor or TV with an HDMI or DisplayPort cable (helpful but not required)

Step 1: Rule out a frozen display before assuming the worst

Press Windows + Ctrl + Shift + B. This key combo resets the graphics driver without rebooting. You will hear a beep and the screen may flash. If the display comes back, your graphics driver crashed during sleep. That is your culprit.

If nothing happens, try pressing Caps Lock and watching the keyboard light. If it toggles, Windows is still running but the display is not getting a signal. That narrows the problem considerably.

If Caps Lock does nothing, the system is genuinely frozen. Hold the power button to force a shutdown and move to Step 2.

A black screen on wake is one of the most frustrating sleep-related PC problems — but it's usually fixable without new hardware.

Step 2: Check whether this happens every time or just sometimes

This matters more than most people think.

Pattern	Most likely cause
Every single wake from sleep	Driver or power setting
Only after long sleeps (hours)	Hibernate/fast startup conflict
Only with specific monitor	Display signal handshake failure
Random, no pattern	RAM issue or unstable overclock

Keep a mental note of the pattern. It will save you from chasing the wrong fix.

Step 3: Disable Fast Startup

Fast Startup is Microsoft's attempt to make Windows boot faster by blending shutdown with hibernate. (It works great until it doesn't, which is often.) It is one of the most common causes of black screens after sleep on Windows 10 and 11.

Open Control Panel, go to Power Options.
Click Choose what the power buttons do.
Click Change settings that are currently unavailable.
Uncheck Turn on fast startup.
Save and restart.

Test a few sleep cycles. If the black screen stops, you found it.

Step 4: Update or roll back the graphics driver

A bad driver update is behind more black-screen-after-sleep complaints than almost anything else. This applies to both NVIDIA and AMD cards, and to Intel integrated graphics.

If the problem started recently after a Windows Update or driver update:

Right-click the Start button, open Device Manager.
Expand Display Adapters, right-click your GPU.
Choose Update driver, then Search automatically. Or, choose Roll Back Driver if the option is available.

If you want the cleanest result for a dedicated GPU:

Download DDU (Display Driver Uninstaller) and run it in Safe Mode to strip the old driver completely before installing a fresh one from NVIDIA or AMD directly. Do not get drivers from Windows Update if you are troubleshooting a graphics problem. Go to the manufacturer's site.

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Step 5: Check your power plan and sleep settings

Windows has a habit of letting hardware sleep more aggressively than your components can handle.

Open Settings, go to System, then Power & Sleep.
Set sleep to a longer interval or Never temporarily, just to test.
Open Device Manager, expand Display Adapters, right-click your GPU, choose Properties.
Go to the Power Management tab. Uncheck Allow the computer to turn off this device to save power if present.
Do the same under Universal Serial Bus Controllers for any USB-connected monitor or hub.

Also check your monitor's own power settings. Some displays, especially budget ones, time out aggressively and do not reliably re-sync after Windows sends the wake signal.

Step 6: Test with a different cable or port

This one gets ignored constantly. (People assume cables just work until they don't. Cables absolutely fail, especially HDMI.)

Swap the cable between your PC and monitor.
Try a different port on the GPU if you have one. Move from HDMI to DisplayPort or vice versa.
If you have a second screen available, plug it in and see if the black screen follows the PC or stays with the original monitor.

If the problem follows the monitor, the monitor is partially at fault. If the problem follows the PC, keep digging.

Step 7: Check for RAM or hardware instability

If none of the above fixed it and the pattern is random, run Windows Memory Diagnostic.

Search for Windows Memory Diagnostic in the Start menu.
Choose Restart now and check for problems.
The tool runs on reboot and logs results. Check Event Viewer under Windows Logs > System for MemoryDiagnostics-Results after it finishes.

Errors here point to a failing RAM stick. Unseating and reseating RAM can sometimes resolve intermittent contact issues. If one stick is bad, pull it and test with the other.

If you have an overclocked CPU or RAM (even from a factory "XMP" profile), try disabling the XMP profile in BIOS and testing at stock speeds. Instability during sleep resume is a known side effect of marginal overclocks.

Common mistakes

Reinstalling Windows first. That is the nuclear option. It rarely fixes a driver or power setting problem, and you lose time. Do it last, not first.

Ignoring the monitor as a variable. The PC is not always the problem. A monitor with a failing power supply board or a flaky firmware update can cause identical symptoms.

Downloading random "driver updater" software. These are almost universally junk or worse. Get drivers from NVIDIA, AMD, Intel, or the manufacturer's own site. Full stop.

Assuming it will fix itself. It will not. A driver crash that happens once during sleep will keep happening. Something changed, and something needs to be undone or updated.

Bottom line

Ninety percent of black-screen-after-sleep problems come down to four things: a crashed graphics driver, Fast Startup conflicts, an aggressive power plan, or a bad cable or port. Work the steps above in order and you will almost certainly land on the answer.

If you have run through everything here and the screen is still black after wake, the problem is likely hardware: a failing GPU, bad RAM, or a dying monitor. At that point, self-diagnosis has limits.

Bring it in to Fix My PC Store on Okeechobee Boulevard or use remote support if you want a second set of eyes before you start swapping hardware. You can also book a repair online if you are in West Palm Beach, Royal Palm Beach, or Wellington.

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