New HD7750: Black screen

As title says, unistalled old videocard, power off, installed the new videocard, black screen. My pc should satisfy all the requirements:

MB: Asrock 945GCM-S
PS: Itek 450

DC OUTPUT: +5v +12v -5v -12v +3.5v +5VSB total
ATX-450ATX: 45A 12A 0.5A 0.8A 26A 2A 450W

Tried also to clear the cmos with no results.
Tried on another pc older than mine but with a ps 500w and black screen.
Tried on another pc much newer than mine (pcie 2.0 and 620W) and worked.
Tried again my old card (4760) and works fine.

So the card is working, there is a problem in my pc, which ?

Thank you for any answer :)
7 answers Last reply
More about hd7750 black screen
  1. grab this 620W again and connect it with your system and try again.
  2. What ? The other computer where i have tested it are not mine :\
  3. The problem is that i have the version 1.20-15A installed and here ( i dont see any newer bios.
  4. just test you system with a different psu , cant you borrow it ?
  5. The 7750 should consume the same as a 4670, so it should be a motherboard problem, but i dont know how to resolve it.
  6. bump
  7. Resolved buying this MB:

    Now window 7 64 reads only 3.54 gb of ram over 6 but whatever
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