The computer is a Compaq Presario 5000. It has a Pentium 4 and windows XP installed on it. Im not any sort of computer-wiz but i do know a little about electronics. A couple months ago, my friend tried to install a wireless card into the tower. after that, she said the monitor wouldnt turn on. so i put off working on the computer for a while because i thought it was just a problem with the video card. well turns out there is more to this problem than i thought. for some reason, dont ask me why, she told me she had to take out the power supply. she dropped a screw in it. ohh man. and now, as soon as i plug the power supply into the wall, the computer tries to boot without me even pressing the on button. the hard drive lights blink as well as the power light on the front and also the cd drive blinks forever. the processor fan turns on as well as the power supply fan. the problem is, it doesnt sound like the hard drive is spinning at all and it sounds like the power is pulsing a bit. sorry, i tried to describe the problem to the best of my knowledge so if you have any other questions just let me know. please help!