Hi! I have a PC under windows XP SP3 which has rebooted several time in two days. I do not have any monitor on this PC, so I'am not able to say if there is any blue screen during the occurence of the problem. Anyway for each reboot of the PC, an event ID 1001 (bugcheck F4) appears in the events log of windows (see screeshot attached). I attach also the minidump saved during the problem. I suspect a hardware problem, does anybody have some clue about the source of this problem? Thanks in advance for your help. jo.