Installerade du inte om windows för din nya burk? Vill du testa rensa drivrutinerna finns Driversweeper tror jag det heter. Sedan så kanske det är så att du behöver en drivrutin för skärmen, borde finnas på HPs sida (om inte windowsupdate hitter den).
Alternativt kan du googla på skärmens drivrutin.
edit: efter en snabb google verkar ditt problem vara nått med Duallink dvi. Bara ena porten skall stödja duallink dvi verkar det som så koppla din kabel tid. Skall vara den närmast ditt moderkort tror jag.
Detta är ganska intressant, stog inget i manualen om detta till kortet ?
http://www.guru3d.com/article/asus-radeon-6970-directcu-ii-re...
"Connectivity wise we ran into an actual issue, our 30" Dell screen is an older model and needs dual-link DVI to get to 2560x1600, While ASUS advertises that the DVI ports on the EAH6970 DCII are dual-link, we got single-link from both of them, trimming down our monitor resolution options. We had to swap out the monitor for a newer model with a DisplayPort connector, after which things worked fine.
Update - there is a switch on the card that can select single link & dual link. All due to there is only 6 deck slots in the AMD GPU , ASUS needs to do this to make sure people able to use dual link after the switch, so:
Factory switch : single link x2 + 4 DP
After switch : 3DP + single link + dual link"
