If you are taking the computer out into the heat of the day via backpack 
or such,
THAT is NOT a good thing for the LT, the LCD screen,  and especially not 
good for Li-Ion batteries.
(I) would recommend that you create a sleeve out of water heater 
insulation material and Duct tape.... *REALLY*!

   The kind like in the picture.
   you can get it at Home Depot and it is a good insulator.
   Just cut into a pattern that can be wrapped around you LT and create 
a pocket sleeve with duct tape.  They have MANY different PATTERNED 
tapes at Home depot too.

It will keep the heat from penetrating into the LT as quickly.


*There IS the possibility that you have BAD hardware too. **
**IF your laptop is a DELL, they have **_extensive_**troubleshooting 
available on their support website (free)**
****
**http://www.dell.com/support/home/us/en/19?c=us&l=en&s=dhs*






RBHWHJ