Several issues can cause a computer not to turn on. A faulty piece of hardware, such as the hard disk, may be responsible for the problem. Power supply may be the issue if the computer shows no sign of receiving power, such as no fun running or no lights on the front of a desktop. If using a laptop or tablet, the adaptor may not be supplying power.

If the computer powers on but nothing displays on the monitor, the monitor may be faulty. A problem with the BIOS may also prevent a computer from turning on despite receiving power. If the computer begins to load Windows but stops and displays a blue window, a STOP error may be preventing it from turning on. A problem with Windows installation may cause the computer not to turn on fully.

Solutions for a computer that fails to turn on depend on the root cause of the problem. If the computer has a corrupted Windows installation, it’s necessary to reinstall the Operating System. To know if a hardware piece is the problem, a user may replace each important piece with an identical but properly functioning one. If the computer is not receiving power, it may require a new power supply.