This is driving me crazy.
I bought an HP PC last year which I have upgraded a few parts in, current configuration is:
Motherboard: Intel H61 Chipset (std)
Power Supply: Corsair GS600 Watt (upgraded)
Ram: 8 GB (std)
Processor: i3-2120 (std)
Graphic card: HD 7770 (Upgraded)
Now everything was running fine with the 7770, but I decided I needed a bit more FPS, so I bought a Gigabyte 7870 OC.
Took out the 7770, plugged in the new card. Both PCI-E cables etc. (everything 100%, it's fitted correctly, the monitor is plugged in etc. So please don't ask about this stuff). but when I boot the PC all I get is a black screen.
Strange. I plugged back the 7770 and everything worked as it should. Tried again with the 7870.. Black screen.. I thought, ok card must be DOA, so I ordered a second card, this time a Club3d Joker XT 7870.
Same exact thing.. Just a black screen. The PC turns on, all fans are running, but monitor shows no display.. When I plug back the 7770, everything works again..
This puzzles my mind. What the h*** is wrong here?