1] Does the PSU fan spin on startup? Some users reported that their Power Supply Unit fan spins on startup but stops after some time. Others reported that the PSU fan does not spin even on startup.

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My issue is straight forward enough - when I try to use my second set of memory slots, the computer won't boot. At all. It'll power up and the fans will run, but it ...

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This sounds like a power supply failure to me. I've had several pc's do the same thing. I think it is one of the most common failures as far as I know.