How to Troubleshoot a Computer With a Blank Screen
A computer with a blank screen makes it impossible to work and get anything done, as you literally can't see what you're doing. Many times, a blank screen is a minor issue that is both quick and easy to troubleshoot. Disconnected cables and the computer's "sleep mode" often cause the monitor to go blank without warning. Troubleshooting a blank monitor properly could save you the money needed for a pricey replacement.
Examine the monitor, looking for any physical damage such as a cracked screen. A damaged monitor may cease to function entirely.
Move the mouse and press keys on the computer to make sure your PC isn't in "Sleep Mode." Many computers go into this power-saving state after a period of idleness and need to be woken up.
Press the power button on both your computer and monitor to make sure both devices are on. Most computers and computer monitors have a light that illuminates when active.
Shut down your computer and monitor.
Disconnect all the cables and wires connected to the monitor and any cables running from the monitor to the PC's system unit.
Reconnect the monitor's cables firmly into their appropriate inputs, replacing any cables that show physical damage such as tearing or fraying.
Connect the monitor's power cord to a working surge protector or electrical outlet. Make sure the surge protector is switched on--if the surge protector is switched off, it won't supply the monitor with any power.
Connect the computer to a different monitor or the monitor to a different computer to determine whether the issue is because of the monitor or the PC. If the PC works with a different monitor, the issue is with the original monitor and it may need service or replacement.
Tips & Warnings
- If troubleshooting the monitor yourself doesn't solve the issue, contact the monitor's manufacturer to see if it's still covered under warranty. You may be able to get a replacement free of charge.