Spent the whole morning trying to install CentOS 6.5 on a relatively new machine using a Gigabyte GA-B85-HD3 motherboard, with a NVIDIA GeForce GT 620. The message I got was that the hardware (or a combination of what) I 'm using is incompatible with CentOS.
As I had Fedora 20 already running on this very machine, I figured that the problem was related to UEFI and wasted a lot of time trying to the get rid of the EFI partition on the Linux disk. Eventually after updating the BIOS and trying all sorts of magic. I disabled the on board Intel graphics adapter and everything worked like a charm.
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I've found that its not necessary to turn off the on board Intel graphics adapter (at least not on the BioStar Hi-Fi B85S3Plus motherboard that I'm using, which also uses the B85 chipset).
Rather, all that I needed to disable was "RC6 (Render Standby)" and "Azalia Internal HDMI Codec". Once this was done, CentOS installed OK and I was still able to use the built-in graphics adapter.
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