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After a succesful on screen POST, screen wont respond

I recently built a new computer using a Galaxy GTX 570, an Antec 750 watt PSU, a gigabyte 990fxa-ud3 Mobo, and an amd fx 8350, along with 16 gigs of coasair ddr3 ram.

I set the whole thing up before installing my HDD and disk drive and i got a succesful on screen POST. After i installed the HDD and disk drive however, the screen does not respond when i turn on the computer.

Any suggestions?
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