|Did you pull the plug while the system was running or did you shut it down properly, then unplug it?|
There was no reason to pull the system apart. Hopefully you know what you're doing & reassembled it correctly.
eMachines are notorious for using cheap Bestec power supplies that have a high rate of failure. Just because a fan spins doesn't mean the PSU is good. If you're sure you put everything back together the right way, the PSU would be the place to start. Do you have one you can try? You don't have to put it in the case, just lay the case on it's side, unplug the cables from the old PSU & position the test PSU where it's cables will reach the necessary connections.