It has worked perfectly fine until the colored lines randomly appeared on the monitor.
I'm not sure what you mean when you say "generic driver". I reinstalled the operating system and so far, I've not installed any other video driver if that's what you mean. In this state, the graphics are very laggy (e.g. dragging windows) and greater resolutions are not correctly displayed.
Edit: I'm not quite sure if I answered your questions. I hope I did.
Edited by Sode no Shirayuki, 31 December 2011 - 01:18 PM.