My PC running XP would not turn on after shutting down the previous evening. I installed a new power supply and the PC turned on again. No video displayed I turned it off, removed the video card, and reinstalled it. I also took of and reinstalled all cables. Now every time I boot up the computer restarts while loading windows. If I "run windows normally" the computer restarts while the XP logo is on the screen. If I "run last known good configuration" the same thing happens. If I boot in "safe mode" the computer scrolls through a list of items loading, holds on "loading ptd.sys" then continues and reboots. If I boot from the XP CD and either try to reinstall or repair installation I get a blue screen with: BAD_POOL_CALL_ERROR STOP: 0x000000C2 (0x00000043,0xC4DBC000,0x00000000,0x00000000) I tried swapping out the video card with no change Any suggestions?