I'm in the process of upgrading an old E-machine, basically just replacing the mobo and CPU. I'm re-using the hard drive CD/DVD drive, floppy etc. I installed a FoxConn 661GX7MJ-H LGA 775 Micro ATX along with an Intel Celeron 420 512 kb L2 Cache CPU (Basically this matched more or less what was in there, while keeping things fairly cheap. Anyway, I get everything back in the case and hooked up, I connected a monitor plugged it in and.....nothing. Nothing came up on the screen at all, I checked all the connections, everything is connected properly, the IDE cables are connected right (nothing reversed) the memory board is seated correctly, all the fans work and the VGA connection is tight. I've built a couple of computers before, no problems, this really has me stymied because I don't have a clue on where to start, the monitor is good so thats not the problem, the only other thing I've noticed is the little hard drive led on the front of the comp flashes, (I even changed the HD but still nothing. As far as the CPU goes (it's that LGA 775 with the pins coming up from the mobo) no problem there, (the chip fell right into place) Hopefully somebody can give me a couple of ideas on what else to check.