I recently installed a new graphics card, upgraded to XP, and installed a new HD to my computer. Then I transferred some files from my old HD to the new one. Everything was working perfectly. Then I took the computer home from my mom's house and on the way home the CPU slid from one side of the car to the other hitting the door. Got home connected everything and started it up. Everything was fine I signed in to the desktop and was getting ready to open a program when the screen went black. THe power was still on but there weren't any lights on the front of the cpu. I had to hold in the button to shut it down. Then I tried again...7 more times... and each time it would power up and go through the 1st startup screen and the 2nd, but then it would do the same thing. The fan still runs and I took the cover off to see if anything had come loose. One of the black and white wires(that leads to the power button) was loose so I pushed it back in. Still nothing. PLease if anyone has a clue that would be super.