I was hoping someone could help me. I went through two different displayport cables and I can't figure out whats wrong. I updated to 15.4 and everything was working fine, then one day I turn my computer on and no display. So I rebooted and tried again..nothing. So then I put my old dvi cable in and it works. I tried changing some of the catalyst settings back on default hoping it would help which it didn't. Not sure if this is important or not but I use msi afterburner only to change the fan speeds though so that shouldn't affect anything. My monitor is a asus vg248qe, and I bought it for the displayport/upscaling which now is pointless.