I have just installed on my HP Pavillion 7750 the Sapphire HD 5670, replacing my old Radeon X1650 SE.
When i turn on my pc, in my monitor appears a "no imput" message, but all cables are connected and GPU's fan starts working. I tried to remove and re-install the card, but nothing appears on screen, just this message.
what could it be?
also i noticed that my power supply has got a max output power of 300W, but the HD 5670 requires 400W.
Now i replaced the HD 5670 with my old card (X1650) and it works perfectly...