computer freezes and restarts itself

Your computer specs please, and at what point in startup exactly does it restart? After Windows Logon, during, after POST. Need more information.
 
intel i5 2500k
coolermaster haf x
MSI P67A-C45
ATI radeon hd 6870
xms3 ddr4 4Gb
cooler maser v6 cooler
corsiar 600w builder series
tp link pci adapter 300mbps
samsung blu ray/dvd writer
500 gb seagate hd

it restarts when it first starts up and when i put in a blu ray dvd. i have built it myself.
i have tried cmos reset and uping voltage or ram.
 
Something seems a little but unstable in your system then.
Can you logon to windows without it restarting first? Check the event viewer for BSOD like said.

If you can also run CPU-Z and post a screenshot. If you can't get into Windows, recheck your BIOS settings.
Disconnect Blu-Ray drive and/or other peripherals to see if it stops, attempt a process of elimination.
 
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