I have a pre-built (factory) Acer Aspire computer. I don't think you'll need the exact name since it's not necessarily a problem with the specific model. I had this computer stock, but then my PSU failed. I put in an identical PSU from my other Acer computer, but now the computer won't start. It will start, but there's nothing showing up on the screen. The case fan, PSU fan and CPU heatsink fan all turn on and my motherboard beeps once loudly telling me it's not a motherboard problem. There's a distinct sound that I've never really "heard" before the new installation, though. My fans and such all power and start running loudly, but around three seconds in it'll all go silent, all you can here is the near-silent hum of all three fans. I don't here the CPU fan running loudly like it usually does when the computer first starts up. I did though take my SATA cables from both my optical drive and HDD, but put them back in. I thought them being switched up might have something to do with it, so I switched them but the problem still persists. Any idea on what's going on?