PC Doesnt boot up-New PSU/GPU

SynthisizeR

Honorable
Dec 12, 2013
74
0
10,630
Hello there! I wanted to make an upgrade on my computer so I bought a new PSU to support my new GPU!
The new PSU is called XFX 850w ProSeries Bronze Edition and the new GPU is GTX 770 Gigabyte Windforce(2GB)
My old PSU was 850w premier and the old GPU was Sapphire ATI 5770(1GB)
The problem is , i unplugged the old psu and gpu and installed the new one. Everything is plugged in but the comp doesnt boot up. On the mobo there are 2 lights up. one red and one green. The psu fan is working. What's wrong?:/

-Notice- There was no problem at old psu/gpu , just an upgrade.
MoBo: ASUS P7P55D
CPU: i5 750 2,6(Overclocked to 3,2) - 4core-4thread-8mb cache
RAM:2x4GB Corsair Vengeance 1666mhz
Cooler: CoolerMaster Hyper 412s 1300rpm
HDD: 1TB 7200rpm
SSD:120GB
 

tshrjain

Honorable
Nov 26, 2013
227
0
10,760
Remove new GPU, plug in old one. See if the system boots. (Old GPU + New PSU)
If not, then remove new PSU and plug in old psu and new gpu. See if the system works. (New GPU + Old PSU)
If not then, remove new GPU and plug in old GPU, see if system works. (Old GPU + Old PSU)

Post your results here.