then you have some incompatible component installed. non-uefi bios on GPU is usual suspect. if you are using the hd6870 it is the most probable suspect. you would need a special UEFI bios for that GPU - http://www.overclock.net/t/1389206/...0-i-can-add-it-to-your-bios/240#post_21111262
same as this.
or maybe you plan to change the GPU for newer
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