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Psu wont turn on

My computer turns on, within a second it turns off no beeps.

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Test the PSU. Unplug it from the motherboard and then with nothing connected, short the green wire to any ground (usually a black) using a paperclip and it should come on and stay on if the problem was with the motherboard/computer but if it shuts down, then you know the problem is the PSU itself.

If the PSU stays on under no load, then one possibility is you had too much connected to it and it shut down as a protective feature. The Bios would not beep if the PSU is shutting itself down. Also make sure you have the internal speaker connected. It's possible you just can't hear the beep because there is no speaker connected or it may be connected to the wrong place.

Don't throw away a defective power supply. It is worth a couple bucks as parts for an electronics enthusiast. Keep it out of the landfill.

Posted on May 08, 2015

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bronk50
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SOURCE: desktop power turn on but

Test your PSU or replace it if your power supply units fan is not working your PSU is faulty

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your "((MOTHERBOARD TO YOUR HARD DRIVE))" make sure they have a secure connection and are not faulty or just replace them they could be faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they could be faulty a computer needs its connections to continue its cycle and have an end so any faulty leads will end up with a computer error even something as small as a faulty electrical extension or fan lead can cause this problem

computers need all of the data and electrical current to travel through every working device and to have an end to be able work properly

a motherboard and a hard drive any leads between them will fail before your motherboard or your hard drive if its a flat ribbon 40 pin type IDE replace it this will be the first to fail check all electrical power input and extensions make sure they are securely seated even the cd/dvd floppy drives need to have current go through make sure these drives are working

also check the Cmos battery and computer ram make sure they are securely seated with no dust built up or in the sockets

hope this helps you

Posted on Aug 10, 2011

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One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive

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