So to go into a little more detail, I have been getting this problem ever since i installed my GT 740. Whenever i PLAY league, at any random time my computer will restart and instead of the regular restart ASUS bios (from what i recall) reports that it shut down the computer because it DETECTED a power surge. This only start happening when i start playing league, for no other game does it do this (I usually play, Rome 2, EU4, 9dragons. I had Shogun 2, APB reloaded, Vindictus, but removed them to make space on my hard drive.) If anyone can provide any insight id greatly appreciate it . Also computer specs(from what i know of) follow.

I have Windows 7
Service pack 1
NZXT phantom computer
16 gigs of gaming RAM(still have to CHECK on that, friend gave them to me)
Corsair CX600M power supply
GeForce GT 740
Samsung 840 250 GB SSD(will update later to check accuracy.)

Not sure what else i need to add. If someone could just direct me to a page that has this problem( or similar one) I'd appreciate it.
Also if more details are needed please let me know as to which ones, i'm not sure what else i should be adding.
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(from what i recall) reports that it shut down the computer because it detected a power surge.