Gtx 780 not working, please help

Spetsnaz141

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Mar 11, 2014
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I've purchased a evga gtx 780, like 10 days ago, i'm not a computer expert or anything
so i checked this page first:
http://www.pc-specs.com/gpu/Nvidia/700_Series/GeForce_GTX_780/880/Compatible_Motherboards

to know if my motherboard is compatible with this card, it's a DH61CR, according to that page, it is. I don't know if it is the psu, but it's a thermaltake tr2 600w.
as i said, i'm not a computer expert so i asked a technician to install the graphic card, everything was fine untill they... turn it on? there was no signal and the computer did't boot, or maybe it did but just the bios logo, then the screen went black and nothing happends, i don't know what to do!
Please, help me, what do you think?
Don't know if it's relevant but my processor it's a pentium g2020 (Really bad, i know)

P.D: Sorry for my bad English i'm not "american" lol But thanks in advance.