I encountered such problem previously... After I install somethings (cannot remember) to the computer, I cannot enter the windows again by different methods like last known good, safe mode etc. I did try to repair by reinstalling using Window XP CDrom, but the same problem exists. During the loading of windows ( the windows xp logo stage ) , blue screen sudden appears lasting for < 1 sec, then it reboots. Thus I cannot see what is the actual problem, and I have no way to get the dump. Anything I can do in the above scenario ?