HELP! My PC crashes randomly without warning or bluescreens

[leebeew]

Specs are as follows:
CPU: Amd athlon x64 5200+ @ 2.7Ghz
GPU: Radeon HD 7770
PSU: 400W thermaltake
Mo/Bo: GA-MA78G-DS3H (rev. 1.0)
RAM: 4GB DDR2
OS: Win 7 pro 64 bit

 

[wishmaster12]

make sure that your computer is cleaned out, and all the fans are working and clean. a computer will crash and reset if it get too hot check to see if you cpu temp is getting too high, I think when it get close to 100 degrees celsus it automatically crashes and resets. sometimes it might be faulty hardware.