I bought a Medion Media Center for school about 3 years ago. Its a good 3.0GHz P4. Well, a while back my graphics card burned up on me and I got a Nvidia Geforce 6600. Ever since, my CPU fan and case fan started to give out and get really noisy so I opted for a new Antec case with a butt-load of fans and a new heatsink for the CPU.

I started to disassemble the components from the old case and transfer them to the new case. I was careful enough to write down where everything went and any other details that I might have needed. I put it all together without much difficulty and turned it on. It shows the P4 icon, flashes the system settings, then shuts off and kind of seizures power on and off until you flip the power supply switch off. BTW, its a 380watt power supply

Talked with some of my friends in the field and they said it might be the power supply, so I started to unplug non-essential power absorbing devices i.e. 3.5 hard disk, LEDs, etc. It did the same thing. I got it down to just the hard drive and video card and still no better. I've checked all the connections over and over and still no leads as to a solution. Thus I venture here for help. Sorry, I don't have the exact motherboard model and all, but if you need more info let me know.

Help me, I'm an animator by trade and I only have until tuesday to get it fixed. I appreciate any help. If you want to converse and maybe talk me through it i have AIM.

sorry, I was able to fix the problem on my own. Turns out it was the hard drive coming unset just slightly when the heatsink fan powered up for OS startup. Along those lines though, I've been looking for one of those Beetle Heatsinks, but I can't find a site or store that has them. Any sources?