Hi A couple of weeks ago I have build a new pc with all new parts and two data drives I already had laying around. The problem started a week or two after the build was ready. It started when playing CoD4, I was just playing as I normally would and all of the sudden me pc reboots without warning. It wasn't like the power went down, the fans kept turning and everything. When it was done rebooting I got a message to check for solutions, but he couldn't find any. The pc would reboot every time I played cod4, sometimes after 2 min, sometimes 1 hour and sometimes it wouldn't happen at all. after some time it started happening when playing other games. recently is reboots when I was doing some work in illustrator. and one time it rebooted when checking my mails. So the problems isn't the games. I thought is was my GPU (because it mostly happens when playing games) but I can't seem to find the problem. I did some googling to find solutions I stress tested everything, my RAM, CPU, GPU, but no errors ware found and nothing is overheating, everything seems to work fine. I also updated all the drivers to the latest version. this also did not help. Now I also checked the event viewer and most of the times I get the same series of events. : - Error : The previous system shutdown at 10:43:33 on 12/11/2013 was unexpected. - Critical :The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly. - Error : Audit events have been dropped by the transport. 0 - Error : The computer has rebooted from a bugcheck. The bugcheck was: 0x00000124 (0x0000000000000000, 0xfffffa8007010788, 0x0000000000000000, 0x0000000000000000). A dump was saved in: C:\Windows\Minidump\111213-11107-01.dmp. Report Id: 111213-11107-01. -Error : Event filter with query "SELECT * FROM __InstanceModificationEvent WITHIN 60 WHERE TargetInstance ISA "Win32_Processor" AND TargetInstance.LoadPercentage > 99" could not be reactivated in namespace "//./root/CIMV2" because of error 0x80041003. Events cannot be delivered through this filter until the problem is corrected. - Error : A fatal hardware error has occurred. Component: AMD Northbridge Error Source: Machine Check Exception Error Type: Sync Error Processor ID: 0 The details view of this entry contains further information. - Error : A fatal hardware error has occurred. Reported by component: Processor Core Error Source: Machine Check Exception Error Type: Bus/Interconnect Error Processor ID: 4 The details view of this entry contains further information. I will upload the events so you can check then for yourself. I will also upload the minidumps. my specs : CPU: AMD FX 6350 3.9GHz Motherboard: GA-78LMT-USB3 Ram : 2 x 4GB RAM 1600MHz GPU: Club 3D Radeon HD 7950 3GB PSU : CoolerMaster Silent Pro gold 450W OS: Win7 64bit I really hope someone here can help me me out.