Power supply cannot jump start

October 12, 2010 at 16:51:44
Specs: Windows 7
I just got a coolermaster 500w power supply and had the strangest issue. When I tried to turn on the computer, the power supply fan would twitch as if it was trying to spin but could not. I tested the power supply using a good PSU tester and all voltages tested good, and the fan spun at full speed while plugged into the tester. I tried the PSU on a different mobo but had the same issue. I tried jump starting the power supply without it being plugged into anything. When I jumped the green and black wires I got the same twitch, so it seemed that the PSU's switch was somehow bad. I returned the PSU and got another one. Same behavior. I tried the jump start trick on another PSU just to make sure I was doing it right and I was.

So the bottom line question is this: What would cause a PSU to switch on and test ok with a PSU tester, but not switch on by a PC's power button or a jump start?

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October 12, 2010 at 17:28:40
Most times you need a load on the power supply. There is also a sense line that returns info to the psu. On some older models they were too quick. Can't say why this is doing that. I am curious about this psu tester.

Why did it take me over a year to phone in a problem to ATT?

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