Can any body please give me any help with this mac pro 3.1 . Right here is the problem im having,the mac will only take 1 memory board in either slow. If i put the other memory board in to the empty slot with memory on or no memory it turns and just hangs, no chime or anything . when i take the memory board out it boots up fine, ok it will do exactly the same if i swop the boards round. So i thought it may be a faulty memory board, so i bought a new board, IT's still the same just hangs there and as soon as i take out the one board away it go's. Can anybody please help as im going to tap dance on the mother board very soon.