1. Generally, the automatic shutdown may be caused by too much dust in the CPU fan, resulting in too high temperature. If so, please clean the dust on the CPU fan and radiator, and add new cooling silicone grease. If it is not this problem, it may be caused by motherboard parts or power supply, voltage instability, hard disk failure and other problems. , incompatible with new hardware. If you can't find the reason, you can suggest maintenance, because automatic shutdown is not a small problem. In addition, Trojan horse system failure will also lead to shutdown, but the probability is very small. Try to restore the system or reinstall it.

2. If you automatically shut down or stand by without any operation, it may be a setup problem. Right-click the desktop, select Properties/Screen Saver/Power/and choose a scheme that suits you from the power scheme drop-down list. Set the list of turning off the monitor, turning off the hard disk and system standby to "Never" to press the application (or set an appropriate time).

3. Open the control panel/turn on the hardware and sound/power options/choose to turn off the monitor (choose never or set the time)/choose never or choose the appropriate time from the drop-down list next to put the computer to sleep (Win7 system).