MSI FM2-a75MA-E35 not posting with both AMD AP34G1608U1K (2x2) RAM sticks in

So I built a system for some friends of mine a couple of weeks ago including a MSI FM2-a75MA-E35 and AMD AP34G1608U1K (2x2) RAM.
Was working great until yesterday. Apparently the turned it off one night and the next day they just got no video signal. ...