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Black screen on displayport


I have bought a new monitor (32´ 2560x1440) that I have on displayport and a second on VGA (22´ 1050x1680)

I have a Dell E6420 with Intel HD 3000 grafikcard

On startup everything seems ok but if I go away for a coffe it seems that both screens are on normal screensave but I cant wake up the big monitor. If I change cables and restart everything is ok till I do a break

My descriptions is a little wage I know but if someone could give som tips on what to test now I have the big monitor on DVI but that cable cant use the better resolution

My guess is that it is something with the grafikcard?

thanks in advance

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