Model: HP p6-2375ea
Motherboard: MSI 2AE0
RAM: 8gb DDR3
APU: AMD A8-5500 with Radeon HD 7450
OS: Windows 8 (x64)
BIOS: AMI 8.08
PSU: Powercool Mod Extreme 650w
Basically, I want to know if I can use my Radeon HD 7850 graphics card. My mobo only has 1 PCIe x16 slot which currently has a card in it (the radeon HD 7450 I think?) which I've hooked up to my HDTV via HDMI and everything works fine. I've tried removing said 7450 and replacing it with the 7850, fits perfectly, and attaching the 6 pin PCIe cable from my PSU, but don't get any display whatsoever. The fan works and by the sounds of things it goes through POST ok. I made sure I removed the 7450 drivers, made sure my mobo, BIOS, and windows were up to date. Any help would be greatly appreciated!