Random PC Reboots!

[IIeMachineII]

Hey guys, I've had my PC for over 4 months now and after a month of getting it, it started to reboot randomly. It's really frustrating because I have tried everything! I'll just be using it when all of a sudden the screen goes black and it restarts. I get a "Kernel 41 (63) Critical error" and it says "Windows shut down unexpectedly" or something like that. I'm desperate at this point and I don't have money to take it to a technician (I'm a jobless 15 year old)

What I have tried
■ Disabling automatic restart
■ Removing each stick of RAM
■ RMA motherboard
■ Re-installing Windows 7
■ Formatting BIOS
■ Replacing PSU
■ Switching to Linux (Back on W7 now)

Below are my system specs
■ Biostar A880GZ AM3+ Motherboard
■ 8GB High Speed DDRIII RAM
■ AMD FX-6300 Six-Core 3.5ghz GPU
■ ATI Radeon HD 4250 graphics (integrated)
■ 500w Power Supply
■ 1tb Hard Drive

Please help me out if you may have a solution to my issue, again, it's very frustrating so any help is greatly appreciated. Thanks!

 

[spigias]

1. check your system for overheating this is a common issue with am3+
2. try to change bios settings to default,turn off any overclocking and change power transitions to standard or normal.
3.with great fear you can upgrade your bios but be aware that if system reboots in updating process it may ruin your mobo.

power transitions worked for me.