After a full rebuild (Had a power surge, blew up my pc, and got all new parts form the electricians wallet)

Everything worked great. Untill one day the fan on my PSU made a weird noise when going over 600w ( I have the recording, its a loud knocking noise). So I pulled it out, and called corsair, they sent me a new one.

This worked great for awhile, and then all of a sudden it started crashing and restarting itself back to my login screen without warning, levels on all my components including temps were perfect.

after countless hours of researching on multiple sites, some of you guys and a local professional, the conclusion was to buy a new PSU.

I bought and just installed a ThermalTake 750w 80 Plus gold, And I had a Corsair HX850 80 Plus gold. Upon updating and playing BF4, it continues the crashing and restarting itself back to my login screen without warning.

ANY IDEAS ARE APPRECIATED!!!!!!!!!!!!!!!!!!