Solved Computer turns on and after 3 seconds turns off and loops

Gigabyte Ga-ep45-ds4p desktop board
September 22, 2016 at 18:57:35
Specs: Win 7 32bit, Intel i3 G3220 3GHz / 4GB DDR3 RAM
I do abit of work on the side fixing computers for friends and family. Got this computer from a friend. As soon as I plug the power cable into the PSU, it turns itself on and then off after 3 seconds and loops forever.

So far I've tested another PSU, does the same thing. I've unplugged all cables to the motherboard except 24pin and 6pin power cables., no devices are plugged into the motherboard either at the back of the computer.

Could a short be causing this on motherboard how do I test.

While i'm waiting for an answer, I've removed the cmos battery, gonna leave it out for about an hour before putting back in.

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September 22, 2016 at 20:55:17
✔ Best Answer
After replacing battery, use only one stick of memory and try to go into BIOS and reset things, then see if it will continue staying on in BIOS for a while. Repeat with other sticks of memory installed. Then boot off CD with Memtest86 on it to test memory. Run it through all tests at least once. If it passes, boot off a CD with Seatools from Seagate on it and test the hard drive, short test. If they all test OK then it is probably not hardware that is installed so try Windows again. This way we are eliminating one possibility at a time. If Windows boots then add back other hardware one at a time and retest each time. If at any point you get a bad issue again then back up and look further. For example, if one stick of RAM does not work alone, try another alone to see if that works. If replacing memory, replace in pairs from matched sets. Post back progress.

You have to be a little bit crazy to keep you from going insane.

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September 22, 2016 at 20:59:22
To clear the cmos it's easier to locate the 'clear cmos' jumper. With the power cable removed jumper it to the 'clear' position for a few seconds and then back to standby.

Do you hear any beeps? If so check the motherboard manual for its beep codes.

Check the motherboard for puffy or leaking capacitors, especially around the cpu.

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September 22, 2016 at 21:34:19
It could also be an overheating issue.

Have you looked at the CPU heatsink and fan?

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Related Solutions

September 22, 2016 at 21:58:44

Removing the battery to reset the bios has worked so far. The computer didn't start on its own when plugging in the power cable. And when i turn on from the power switch it did not shutdown and start again. So means the PSU is ok. I went into the bios, adjusted a couple settings after loading fail-safe defaults. And rebooted. Entered bios again and watched the temps of the CPU and motherboard. Hovering around 38". Let that be for 20mins, temps didn't move much at all, stayed between 37 and 40. Now testing memory with memtest86 on a hiren boot cd.

Will update again later.

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September 23, 2016 at 16:23:32
Update. Computer is running fine now. Memory passed the test. And also hard drive passed a test too. No puffy capacitors on the motherboard. So it was probably a corrupt bios.


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