need help pc wont turn on when i upgraded technical

Gatzilla Gat

Honorable
Aug 30, 2013
40
0
10,540
hi guys im in a dilema i was trying to put together a pc for myself but i didnt boot up only booted for half a second just a flash on the hd gpu cpu

im not sure if its the psu or motherboard i removed the ram gpu and left the cpu in there but still same problem mb ram and cpu is new.

my psu and gpu is from old computer
RAIDMAX RX-500S 500W ATX12V

cpu - i5 2500k
gpu -gtx 9800
mb - GA-P67A-UD3-B3 (rev. 1.x)
Intel® P67 Chipset

i dont know if it might be the psu cause the power connector need 2x4 12v and i only had 1x4pin available so i tried mixing 6pin with a 2pin and i think another 4 pin with the 4pin that didnt work either is there anyway to solve im a lost soul
 

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