I was able to completely solve this computer on my Studio 1555 by doing the 
following:
1. Run the command "sudo amdcccle" (no quotes)
2. Under the PowerPlay page (left), uncheck the box "Enable PowerPlay"
3. Click "OK"
The problem was that the graphics card on my computer was overheating, not the 
CPU (I kept a CPU log to be sure of this). If you have an ATI card similar to 
mine but don't have the ATI settings manager (amdcccle), you can download it 
from the ATI site: http://support.amd.com/us/gpudownload/Pages/index.aspx

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laptop overheats and suddenly shuts down/off
https://bugs.launchpad.net/bugs/370173
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