Why does the computer keep restarting?

Computers restart on their own because of hardware and software problems. Determining the culprit will likely require expert help. Most problems can be fixed and won't require purchasing a new computer.

If a hardware problem is at fault, the most likely culprit is the power supply. In some cases, using a replacement power cable can fix the problem. If the computer boots up normally and loads the operating system, problems with a device driver may be to blame. Removing unnecessary device drivers may fix the problem, but reinstalling the operating system may be necessary if the problem persists. Experts can determine the cause of most restarting problems.