More than likely your plugged with dust at the copper ventilation tube insert go and dust all that out. This means taking it apart and doing a complete cleaning. These are managed by thermostats which go off when to hot. When most laptops computers are on and off again over and over or periodic over time showing that sign, "Heating" is the issue you can place fans do a lap fan and still have this issue until you open it up and do a really good removal of dust compaction. Also I suggest since it will be opened up if you have never done this take it in to have it done correctly and also change out the Thermo paste a well while your at it.
If this does not fix the matter then the LCD screen is going out or needs a new back lamp installed. That is about it. Thanks for posting your question. John
If your laptop appears to boot up and the hard disk LEDflashes, then the problem is probably a back light fault. This can be a faultyinverter or a faulty CCFL lamp. Please click on this link and follow myinstructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
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