Monitor blacks out on 120hz using displayport


I hope one of you has any suggestions..
I just bought a new monitor (benq xl2420t) to replace my exploded samsung 900 crt.
I connected it to my laptop, a hp envy 17 which i got from work. I am using the displayport as there is no dvi available on the laptop, and hdmi does not support 120hz afaik.. I'll post specs when i get home.

Either way, it took me a while to calibrate it but now the screen works fine on 60hz. However when I enable 120hz using duplicate/extended/main only mode (windows 7) it occasionaly blinks black for 1-2 seconds and then resumes to work as it should. Sometimes this occurs multiple times a minute, sometimes it doesnt for 15 minutes...

I have tried alot of things found on google/forums/... But to no avail. Already spent a day on it, about to give up..
Any of you can bé of assistance?

your graphic card most likely doesn't support it
avi morgen?
normaal gesproken wel!
Mooi man, we hebben je hard nodig namelijk haha. Kom morgen maar online zodra je kan =]
he hoe laat moet ik er zijn? heb nog wat dingen te doen :O en feyenoord speelt om half 3 !
Rond 7/8 uur begint t volgens mij pas ;)
Check if your graphic card supports the desired hz at your resolution:

image: 949Mb
Try installing the drivers located on the cd, although you've probably already done this.
Also someone on tomshardware says this in response to someone having issues with colours: You can try with an RGB cable, but you won't get 120Hz with it I think.

I have the same monitor and using the dvi cable and I get 120 hz without any problems.
thanks for your comments.
In the end I just did some more random stuff with some betadrivers for my card and now it does seem to work properly, let's hope it stays like this :O)
avi tonight? :D
In 15 min :D
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