On 2/10/2013 9:56 AM, David Farber wrote:
This Toshiba Satellite A135-S4656 laptop was given to me with the complaint
that it shuts off after a few hours. I had it on for a few hours last night
and it worked fine. The owner said that before it shuts off, the mouse
pointer starts behaving erratically and the entire system slows down. To me
this sounds like the heat sink might be getting clogged with dust causing an
overheating problem. I also noticed that the fan is quite noisy at times and
you can hear the speed vary. Before I take it apart I'd like to know, are
there any other common issues with this model that would cause shut down
problems?

Thanks for your reply.
Sounds like a fan/dirt/heat sink compound problem.
I've found thick gun oil to be good for noisy fan bearings.