so it often works just fine- but every now and again the screen gets massive vertial lines. When loading a graphics intensive program like civ 5 for example it will often (but not always) cause the system to do a hard restart. often i get errors around graphics card issues. some times when rebooting it will load up with the problem is- i take it in for repair and the authorized repair center says it's passing all the graphic tests so the video card/ logic board cannot be replaced. however as you can see from these screens- it's pretty fried. it happened 6-8 times this weekend alone. it does not seem to be heat related either since it occurs randomly and often when the compute rhas been off for a few days. also note- you can still type and interact with teh machine. one weird thing, wehn I see that crazy login screen with the vertical lines, if I login- i will often get normal screen back after it logs in. altho it may reboot several times to get there. It's a 17 incher which they do not make- and I don't want to lose it. based on the pics of the screen behavior- what could it be?