I have an E Machine W3507 it has a Celeron D Processor 2 gigs ram ( upgraded ) ATI Radeon Xpress 200 video. Every thing but the ram is factory.

My husband had it in a questionable position, and it fell and the power box plug-in shattered. When i found out i opened it up to see if any other pieces had fallen off, NOTHING looked unusual on the mother board. I took out the power supply to see what the damage was. It was a goner. So i took a good look at the mother board, it isn't cracked and nothing looks fried. A friend suggested a piece feel off that i didn't notice. I REPLACED the power supply and now the power light and a light on the mother board are the only THINGS that come on. Nothing turns, the fans don't work. Only lights come one.

Could the mother board of cracked and i just cant see the crack?
Could i have gotten bad power supply?
Could something of fallen off the motherboard that would make it not run?you might have cracked the motherboard and cant see it You need to take it to someone with "experience" to thoroughly check out all the connections from your power supply, make sure the ram MODULES are seated properly, the cpu/heatsink, and that everything is grounded correctly..ie motherboard to case.
good luckI would also say that if it fell your HDD probably took some damage and might not be working properly