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How to determine failure of computer's power supply?
If your computer keeps restarting for no reason, there is probably a problem with your power supply. How to check status of your power supply?
If cause of virus is ruled out, you should focus on checking if it is caused by poor heat dissipation of CPU, graphics card, etc., and CPU overheat protection will automatically restart. The power supply is easy to check. First, turn off host power supply, unplug power plug connected to motherboard (old 20-pin, new 24-pin), use a thinner wire, insert one end into green wire hole, and other end insert into any black wire hole, and then turn on power supply. If fan rotates and there are no other abnormalities, this proves that power supply is basically on.
Power on, so is power supply working?
There are three places to check if power supply is working:
1. Is cooling fan on back of power supply spinning. Note. If power supply is defective, its cooling fan will not spin, but it is also possible that fan itself is broken, so you should check other places to determine if power supply is broken.
Second, is POWER indicator on host computer panel lit? Explanation: The LEDs on host computer indicate operating status of power supply, hard drive, and floppy disk. If these LEDs are off, power supply is probably not supplying power.
3. Can't hear operating sound of a floppy drive, hard drive, or CD when you start it up? Note: The computer will check these hardware devices at startup, if you don't hear these sounds, then they are not powered at all.
If it is confirmed that power supply is not working, how to solve this problem?
If you are sure that power supply is not working, do not assume that power supply is defective, you can check following places:
1. The main switch has tripped and plug has come off. If an extension cord is used, check if fuse of the extension cord is blown.
Second, whether power supply turns off due to a short circuit: since power supply itself is designed with a short circuit detection function, it will automatically turn off all power supplies when a short circuit is detected in output circuit, resulting in a power failure. . This situation can be seen by operation of cooling fan. If power supply is OK and there is a short circuit somewhere inside host, then when power is turned on, fan will stop after spinning and make a buzzing sound. If you turn off switch for a while, fan will spin on its own several times.
This symptom is a typical short circuit phenomenon. To determine which component is causing short, you can disconnect all DC output connectors from power source. connectors back one by one until short circuit occurs again, it can be confirmed that component is broken and component can be replaced. It should be noted that before pulling out connector and connecting connector, you must turn off power so as not to burn parts of computer.
3. Is DC output of power supply normal? If above three points have been checked and power supply is still not working, you can use a three-purpose voltmeter to measure DC output of power supply. If there is no output at all, indicating a problem with power supply itself, replacing power supply should fix problem.