Random lock hard ups now and then

[Prismaa]

Hello, I recently built new system, i5-3550, Asus P8Z77-V LX2, GTX 660 and 8gb ddr3 PSU is cooler master real power M620, running windows 7 64bit sp1, and im having this annoying issue with hard lock ups now and then, my mouse and keyboard stops responding and my both monitors just freezes, all i can do is reset my pc, i ran ramtest for around 8hours, and ran prime95 + furmark tests but didn't get any issues with those, and about my core temps, they are around 44celcius max when ingames and my gpu runs around 57celcius max, oh and i haven't really touched anything in my bios.

 

[sharkbyte5150]

Try updating the BIOS using the "update BIOS from Internet" feature within the AI suite software that came with motherboard. If that doesn't work, I'd try running with a different power supply. Are all the correct drivers installed for motherboard and graphics card?