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New HD7750: Black screen

Last response: in Graphics & Displays
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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 http://www.asrock.com/mb/Intel/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 :) 

More about : hd7750 black screen

rickett said:
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 http://www.asrock.com/mb/Intel/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 :) 


I would say update your bios, the 7750 gets all it's power from the pcie slot
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