Monitor won't wake up from sleep mode

Symptoms

• Monitor stays black or shows 'No Signal' after waking the computer
• Moving the mouse or pressing keys doesn't wake the screen
• Monitor's power light shows a sleep/standby color
• Restarting the computer fixes it temporarily

Likely causes

• CommonVideo cable losing connection during sleep/wake cycleSome cables and ports don't reliably re-establish a signal after a sleep state.
• CommonGraphics driver failing to properly resume outputThis is a known issue with certain driver versions, especially after Windows updates.
• PossibleMonitor and computer sleep timers out of syncIf the monitor sleeps on its own separately from the PC, timing mismatches can cause a stuck black screen.
• PossibleUSB-C or docking station power delivery issueMonitors connected via USB-C hubs or docks can fail to resume video output correctly.

What to do

1. Try pressing a key or moving the mouse, then wait 10–15 seconds before assuming the monitor is truly unresponsive.
2. Turn the monitor off and back on using its own power button while the computer is awake.
3. Update the graphics driver to the latest version, since sleep/resume bugs are commonly fixed in driver updates.
4. If using a docking station or USB-C hub, connect the monitor directly to the computer's video output to test.
5. In Windows Power Options, adjust or disable the 'Turn off display' timer to see if a mismatched timer is contributing.
6. As a workaround, try disabling sleep mode entirely for a few days to confirm whether sleep/wake is truly the trigger.
7. Reseat the video cable at both ends, since a marginal connection is more likely to fail during a resume event.

Tools and parts

• None

When to call a pro

If the monitor still won't wake after a driver update and a direct cable connection, and only a full restart fixes it, this is a known compatibility issue some users resolve by updating monitor firmware or switching cable type; a computer shop can help diagnose further.

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