I have and been trying to fix a dead computer (it's not mine), I done what could have been the obvious and foremost cause of a dead computer and that is used a working power lead - no luck! I put in a new PSU - no luck! Today I installed a new motherboard and still no luck. I hooked up the hard drive and the previous PSU to an old computer of mine and they both work. I put a Digital Meter across the front panel pins and there was a voltage reading, I even applied a screwdriver along the front panel pins for the power and there wasn't even a spark, bearing in mind that this is a new board.....any ideas anyone?
Stirred up memories from a long time back when I almost tore my hair out with a similar problem on a new build, it turned out to be a faulty reset button on the case front which was permanently locked in the reset position, a replacement of the momentary action switch fixed it though
I have also in the past removed all the mounting screws holding the motherboard in place then slid a thin sheet of cardboard under the motherboard to keep it clear of case
I would also disconnect the front panel connector if it is a one piece connector unit with the individual connectors type leave only the startup one connected, or try the screwdriver momentarily across the appropriate place on the MB connection pins (do not expect to see a flash though the voltage on the startup pin connection is only 3.5V DC with a current of a few Milli Amps)
As suggested in the other posts the absolute minimalist approach in testing is to be highly recomended
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