Solved: Random shut down, freezing and rebooting before windows? yes another "my pc is rebooting", sorry but I need help. Rig is: mobo Gigabyte ep43 DS3L Q8200 stock clocks 2gb corsair 8500 PSU 620HX corsair (was coolermaster 450w) GPU Gigabyte 4670 (was 1950 pro) HD 500gb Samsung F1 XP SP3 32bit When I first built it, I installed xp SP3 and noticed that once or twice it would post at start up, go to load windows (black screen before the little loading bar) and then crash with the monitor indicating no signal before it rebooted again, before loading windows normally. Being only my second build I ignored this problem Anyway, it didn't happen much, maybe once a week, so I replaced the 450w coolermaster with a 620w Corsair. problem still happened once a week. I ran memtest, but it picked up nothing. I swapped ram slots, problem still happens. I swap gpu to current 4670. I swap ram to ocz 1066, no change. Now the problem has gotten worse. It takes numerous attempts at start up to load up to windows and stay there, and even then it will crash 3-4 times a day. At load up now it typically cycles through the post screen a few times before making it to windows log in, where upon it will freeze and need to be restarted. This will normally happen 1 or twice before it stays running. When it crashes during th day it seems to reboot back into windows first go, without all the hanging and freezing. My windows error screens when it does load up say that the computer has recovered from a blue screen event but that the error logs are corrupted and cannot be read, also telling me that this is rare and indicitive of serious problems. What's left that could be the problem? I have a gigabyte ep45 mb and was going to connect up the hd and try and load it up on the system in my sig just rule out any software cause. Is my ep45 similar enough that it will boot and run the hd from the ep43? Is it probably my mobo? Have I ruled enough stuff out to put in an rma on the mobo? Thanks Tye Ok, swapped out the hd from the ep43 board and run it on another system. It booted fine and went into windows (of course windows now wants to be reactivated). So I guess I've ruled out software prob (and hd). So it's down to the last two hardware pieces, cpu and mb.