Ive got an HP P7-1233W that I wanted to upgrade. So Ive installed a new 500W PSU and an MSI Radeon R9 280 3GB GPU. The problem Im having is that once I install the drivers from the included disc, and shut down the computer and hook up the new GPU, the computer will not start. I am getting no signal from it. Ive got all the power cords connected and the card is seated nice and tight.
I noticed that If I unhook any of the power plugs, the com0uter will work fine with the integrated graphics and all of the fans on the GPU are working.
Please let me know if you know what I need to do to get this GPU working.