I installed an 8800 GTX in place of my 7800 GTX. The powersupply is a Silverstone 600W with two PCI express power cords, so it hooked up both required power slots fine without having to use molex connectors or the supplied adapters. I hit the power button and got a slight popping sound followed by a fried electornics smell from the powersupply. I've had this happen before on another computer and it still worked fine after letting it rest for about thirty minutes (despite the obvious indication that it's probably totally fried). I wait thirty minutes and turn it on again, this time it gives off an ear splitting screech much like a fire alarm so I QUICKLY shut it down. I wait thirty minutes more, take out the video CARD and turn it on, everything starts up, the computer sounds like everything's good (no monitor so I can't see anything, but I can recognize the HDD sounds). I shut it down and plug in my old video card and turn it back on, fans are all spinning but there's no display. The HDD access light STAYS on, but there's not much sound from the HDDs and there aren't any beeps whatsoever from the motherboard. I'd imagine I fried the power supply and the motherboard at least. Are there any other indications I should look for when determining things to replace, considering I can't turn it on to troubleshoot anything at this point. Once I get all the replacement stuff....what can I do to avoid this situation again? What could have been the problem that killed the powersupply to begin with?Typisch ........I need a bit of clarification....... you say Quote

The powersupply is a Silverstone 600W with two PCI express power cords, so it hooked up both required power slots fine without having to use molex connectors or the supplied adapters.