Hello fellow gurus. Usually, I can handle myself... But a little help won't hurt as the symptoms are unusual to me. First of config : - read my profile for most of it. - drives : 1 OCZ vertex 2 before LE revision. 2 western digital caviar green 1Tb in raid 1. They were setup on the RAID controller with AHCI enabled. What happened : - One day, was playing a game and game froze, blue screen, auto reboot. - No problems for a couple of weeks, I thought it was just bad luck. - Yesterday : same as day 1, auto reboot : freeze instantly. Manual reboot: displays some bios messages : freeze. Manual reboot : displays more bios messages (a little further) : freeze. Manual reboot: "overclocking failed !!" I say continue, freeze. Manual reboot: "overclocking failed !!" I load defaults, freeze. Wait a bit, chill out, shut off the rig for a minute. Boot : starting windows, freeze after logo, before password prompt on the black image. Start pestering, get a bit nervous : I shut everything down, UPS as well and leave stuff for an hour. Boot : like nothing happened. All was perfect. Played a bit, a piece of heaven. Today : come from work, boot : "overclocking failed" : I load defaults. No boot drive ! * big, nervous eyes * Reboot, same thing. Use failsafe button on the motherboard, says defaults are loaded, no boot drive. Go to the bios, find that the SSD is in third position on the drive boot order. Move it to first one. Boot : sucess. But... The raid setup disapeared, memory settings where still the same before I pushed the failsafe button. Right now It's working, I'm writing this post with it and backing everything up. My guess is the motherboard. What do you think ?