Monitor 'No Signal' on wake from sleep — fix in 2 minutes
PC wakes from sleep, monitor stays black with 'No Signal'. Almost always a GPU power state handoff glitch. Here's the quick fix.
Quick answer
Disable Fast Startup in Windows power settings, then in Device Manager, find your GPU under Display Adapters, go to Power Management tab, uncheck 'Allow the computer to turn off this device to save power'. Reboot. 90% chance it's fixed.
Why this happens
This is a classic handoff failure between the GPU and the monitor's EDID (Extended Display Identification Data). When your PC goes to sleep, the GPU enters a low-power state. On wake, it's supposed to re-negotiate the display link — but Windows' Fast Startup corrupts that handoff. The result? Monitor sees no signal, sits on its 'No Signal' message, and you're left jiggling the mouse like a fool.
It's not a hardware fault — not your monitor dying, not your cable. The culprit is almost always Fast Startup, a Windows feature that hybrid-shuts down to speed up boot times. It messes with the GPU driver's sleep/wake logic. I've seen it on every generation of Nvidia and AMD cards, from GTX 900 series to RTX 4000, and Radeon RX 500 to 7000. DisplayPort is worse than HDMI for this, but both suffer.
Fix steps
- Turn off Fast Startup. Open Control Panel → Power Options → 'Choose what the power buttons do'. Click 'Change settings that are currently unavailable', then uncheck 'Turn on fast startup (recommended)'. Save.
- Disable GPU power saving. Press Win + X → Device Manager. Expand 'Display adapters'. Right-click your GPU → Properties → Power Management tab. Uncheck 'Allow the computer to turn off this device to save power'. Click OK.
- Reboot. Not a restart — do a full Shut Down, wait 10 seconds, then power on. This clears the GPU driver state entirely.
- Test sleep. Press Win + X → Shut down or sign out → Sleep. Wait 30 seconds. Wake it with keyboard or mouse. Monitor should come back instantly.
If it still fails
On rare occasions, the above isn't enough. Here's what else to try:
- Change cable or port. If you're on DisplayPort, try HDMI. If you're on HDMI, try a different monitor port. Some monitors have a 'deep sleep' feature on certain ports that ignores GPU wake signals. Check your monitor's OSD for 'Fast Wake' or 'Quick Start' and disable it.
- Update GPU driver. Use DDU (Display Driver Uninstaller) in Safe Mode to nuke the old driver, then install the latest from Nvidia or AMD. Don't bother with beta drivers here — stick to WHQL.
- Disable PCIe link state power management. Control Panel → Power Options → Change plan settings → Change advanced power settings → PCI Express → Link State Power Management → set to 'Off' for both battery and plugged in.
- Set a static resolution in GPU control panel. For Nvidia: Nvidia Control Panel → Change resolution → choose your native resolution. For AMD: Radeon Software → Display. Forces the GPU to output EDID at wake.
- If you're on a laptop with hybrid graphics, go to BIOS and set the primary display to dGPU-only. Hybrid switchable graphics are notorious for this issue on wake.
Prevention tip
Keep Fast Startup off permanently. You lose maybe 2-3 seconds of boot time — worth it to save your sanity. Also, set your monitor's standby mode to 'Standard' instead of 'Power Saving' (check your monitor's on-screen menu under 'ECO' or 'Power' settings). Some monitors, especially Dell and LG, aggressively cut deep link negotiation in power saving mode.
One last thing: if you're using a KVM switch, blame that first. KVMs with EDID emulation often fail during the wake handoff. Bypass the KVM for a direct cable test before anything else.
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