I have a eMachines T3256. My house's power went off, then came back on the other day. Now, when I turn on the computer, the hard drive light comes on and stays on, the cooling fans work and that's all. The power switch on the front won't even turn it off. I have to unplug it. There is no POST beep or any indication that anything is happening. I've unplugged all cords from back, left the CMOS battery out for several hours, reseated the memory, removed the modem, still nothing. I don't have another CPU to stick in it.
I tried a new power supply, same result. I don't have a large budget. Any ideas what to try next?

Help with MOBO/CPU/Memory