I have a Emachine from a friend of mine... They couldn't get it to boot up, I said it is probably a bad power supply. Well, I uninstalled the power supply and sure enough, it was toast. I can only guess it was a voltage spike because a capacitor was burned off and bouncing around inside the casing of the power supply. I got a new one (upgraded to the 300 watt vs. the 250 watt, because it was a $10 diffrence) and a new CPU fan. (As per the E machine web site). After a carefull installation, I went to power her back up and now, it powers up WITHOUT the on/off button, and NOTHING comes up on my screen. The CPU fan NEVER kicked in. (although the CPU got VERY hot) My next guess is the motherboard... But I figured I let a few people kick it around for a while...

I think the machine is toast, if the PSU has blown, it is likely that the computer followed suite. However, you could try reseating the cards and cables, to see if that helps the graphics and CPU Fan. Why did you replace it, when you said the PSU is dead? Hope this helps The world is full of willing people, some are willing to work, others are willing to let them; just a thought!

The motherboard is toast. there is no way it should start without touching the powerswitch and if the CPU fan doesn't spin but the CPU is getting power that's another bad sign. It's likely the motherboard was toast first and it took the powersupply out as a consequence. Usually if a PSU fails by itself nothing else is damaged. Bad news is you have no way of knowing if any of the other components such as CPU,ram,graphics or other PCI cards or drives might have also been damaged in the meltdown. Only way is to test them all individually in a compatible working system. Decision time now whether to try resurrecting this system or consider getting a barebones upgrade box. In the long run an upgrade might be the best option. Give a man a fish and you feed him for a day. Teach him to fish and his wife will never forgive you.

The CPU fan could be dead or the heat from the power supply heated the cpu fan till it got deformed hence cannot spin. When the CPU is not cooled, the computer hangs within the first few seconds or may not even start. If its an Intel P3 and above the CPU is probably still OK if its an AMD chances are not good. Before trashing the system, buy a replacement CPU and see if it works out. CPU fans are quite cheap.