:O
This happens to me aswell... thank god i just renewed my warranty for an extra 2 years, might have to look into this, cos its definately not good...
Hello im new here, I also have a 7700m
I ran mine with the lid shut on a external monitor a few weeks ago, it was ok for about an hour or 2 but then extreme artifacts came up on screen, I shut down and left it for about 30mins to cool...