After a thourough physical cleaning of the laptop, I had found that the main cpu cooling fins were plugged with lint. (I bought the computer used) I brushed, blew, vaccumed all the dust and lint out of the case. I still have a few lines on the display, so I figure I need to replace the graphics card. I am familiar with the heat issue in PC's, I assume it is a bigger concern with laptops. What should I look out for as indicators that the main board is flaking out? Would this do similar things as a PC? I have bee lucky enough to find a NOS graphics card. If I have to replace the main bord also, at some time, I feel like I would be better off scrapping the unit and getting a brand new one.