Ok, first of all I have never used A forum before.
My problem is I installed my Asus Radeon 7750 into my HP p7-1423w and upgraded power supply to A Antec 550 watt continuous power and my computer does not boot. After A minute or two my monitor will turn on to a black screen and i can move the cursor. Task manager wont work, or anything else. I disabled Intel HD graphics drivers, and disabled them by going to device manager/display adapters. I am on Windows 8.
Also, if I take the card out everything works fine.