Hi, I have a R9 280 that is not POSTing after upgrading to this DH67CL motherboard.
The card is seated properly in the PCIe slot, and the two 6 pin connectors on the card are connected to my 600W OCZ PSU.
I can mess with it long enough (Changing BIOS settings, etc) to get it to work, it will boot into windows, run games, etc. but after about 15-20 minutes of playing a game, or if the computer goes into standby mode, the monitor shuts off and can't be woken again, or if it is woken, nothing is being displayed.
After holding the power button down until the computer shuts off, I'll restart only to get the motherboard error beeps that no video card is installed.
ONboard video works fine, no problems.
Full Specs:
Intel DH67CL Motherboard
Intel Core i5 2500k CPU
16GB G-Skill Ripjaw Series DDR3 RAM
Sapphire Radeon R9 280 3GB GPU
OCZ 600W PSU
BIOS is updated to the latest version (just did the update an hour ago to see if that was the problem).
The only thing I'm thinking is it could be the 8 pin connectors? The GPU has two 6-pin connectors, and I'm using an 8-pin to 6-pin on one of them and an 8-pin to 6+2 on the other. LIke I said, it works, driver is updated, but shuts down, then the motherboard reads it as not properly installed and I can't get it to POST.
