Start with power: outlet, power strip, cable, and adapter. If the computer shows signs of life but no picture, the problem is often the monitor or its cable, not the computer. A completely dead computer with known-good power usually has a failed power supply or motherboard.
Common causes
Power issue
A switched-off power strip, loose cable, or failed laptop charger is the most common cause.
Drained or failed laptop battery
A deeply drained battery may need to charge for a while before the laptop responds.
Display, not the computer
If fans run and lights are on, the monitor, cable, or input setting may be the problem.
Failed power supply
Desktop power supplies wear out, especially after power surges.
Hardware failure
Memory, motherboard, or other component failures can stop a computer from starting.
How to fix it, step by step
- 1
Check the outlet and power strip
Plug something else in to confirm the outlet works, and make sure the power strip is on.
- 2
Check cables and the charger
Reseat the power cable. For laptops, check the charger light and try another compatible charger.
- 3
Hold the power button
Unplug, hold the power button for 15–30 seconds to discharge, then plug in and try again.
- 4
Check the monitor
Make sure the monitor is on, set to the right input, and its cable is connected at both ends.
- 5
Listen for beeps and watch the lights
Beep codes or blinking lights often indicate which component failed — note them for the technician.
When to call a technician
If the computer still won't start, we diagnose it and recover your files if the drive is healthy, even if the computer itself needs to be replaced.
On-site support across Orange County · see our IT support, managed IT, Microsoft 365 support and cybersecurity services.
Frequently asked questions
Will I lose my files if my computer won't turn on?
Usually not. The drive is often fine even when other parts fail, and files can be recovered to a new computer.
Why does my computer turn on but the screen is black?
Check the monitor, cable, and input setting first. If those are fine, the computer may have a graphics or memory problem.
Can a power outage damage a computer?
Yes. Surges and sudden power loss can damage power supplies and drives. A surge protector or UPS reduces the risk.