I have an Inspiron 15R N5110, and I reinstalled the win 7ultimate, then I installed all the recommended drivers.

Now when I playing or using the laptop, the dispaly resolution always changing, first everything is black then the resolutinon changing 800x600 then 4 second later it changing back the original resolution...... it is very anoying.

My videocard is an intel hd graphichs 3000