Hi i am fixing up my previous computer who powers box blew and ruined the motherboard. I go a pentium 4 motherboard [no manual] which my cousin installed last night along with and a new power supply [only 250w]. we hooked up 2 hard drives and reformatted them windw xp last night. we couldn't figure where to plug in the power led and h.h.d led but got the power sw and the reset sw in the correct spot [i think]. anyway everything was working fine, i shut down the computer and now the next day, nothing happens. I push in the power button, no noises no nothing. On the mother board there is a small green light that is on, so i assume my power supply has't blown up again? I plugged it into different plugs around the house and unplugged the hard drives [only lines, not white band] one at time and tried the power, i pulled off the ram 2-256mb and plugged back in. nothing. any ideas?