I'm having a problem with monitor ghosting on my computer. I was messing around with the cables on my computer because I noticed a little stuttering. I was using a Asus VG248QE with a Dual-Link DVI cable into it at 144hz, and that was fine. But when I switched to 60hz, I noticed very visible ghosting. I've switched like this many times before, and it just started happening now. Please help!