"But after it was assembled, I found a defect - a faint, flickering green band across my monitor. It sounds like a problem with the monitor or the cable, but it wasn’t - it disappeared when I installed an inexpensive video card, bypassing the motherboard’s HDMI port. For a server, the defect made absolutely no difference whatsoever, since the system wasn’t even going to be plugged into a monitor. But it could be a sign of a failing motherboard." (excerpt)