Can't find problem on my motherboard

[iambotplay]

At first im not pc expert!
My PC instantly reboots after 5-10 seconds when Windows Starts. Thats why i cannot run any app which can check errors... All capacitors and visually MB looks good. Testing all my components separately with new PC i figured out that problem is Motherboard. Anyone know what wrong with my MB?

MB is - ASrock H81M-DGS

 

[Supahos]

If it's actually "the motherboard" then you're pretty much going to have to get a new one, they aren't really repairable

 

[iambotplay]

If it's actually "the motherboard" then you're pretty much going to have to get a new one, they aren't really repairable

You know pc works well when im in bios. bios works without any problems, but when i run windows it reboots without shutting down the OS. Its looks like someone pushed reboot button.. even reinstallation OS didn't help... i hope that its possible to fix...