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Do you have a way to do a hard reset of the BIOS ?
Bios: 10.1 (according to User's Manual)
MEM: 1x4Go GSkill DDR3
The bios version of your board is not listed in User's manual...
What 350W psu? >>Posting Guide<<
What GSkill stick? >>Posting Guide<<
Try reseating cpu and retry with testing the memory stick in any mem slot one after the other.