PC wont POST after installing new GPU

Im buliding a new pc recently and my spec are:

CM GX550w
Asrock H77m
Sapphire HD7850 OC 2gb

Now the problem is, after installing the hd7850, the pc wont post or boot, not even bios, it just black screen, and i can boot in windows fine with intel hd graphic or another hd7850 (non-oc) from my friend.

550w should be more than enough for a hd7850 oc and what i have tried are:

setting the bios
reset cmos
update cmos
check the power connector

is it clear for me to declare it is a bad or faulty gpu?
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  1. I'd say doa given a similar model works fine. Doh!
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