Toshiba Qosmio x775 Randomly Turns off and on itself.. PLEASE HELP!

Whenever I turn on my Laptop Toshiba Qosmio x775..it randomly turns off then turns on itself..sometimes for just 20-30mins or sometimes less than or sometimes in can run the for many hours..the problem is not with the Adapter because i try to put the battery and unplug the adapter and still it happens randomly..dunno whats the problem with this..
Mostly i researched..they said it's overheating..they said to check if the fan is full of dust something like that..but none of it works..I downloaded a program CoreTemp to check the Temperature for overheating issues..and it's only on 45-50 degrees..and that program has overheating protection to shutdown if it reaches 90 degrees..but in my case in does not reach that degree and still shuts down..hayy..need help badly..

SO FAR SO GOOD FIX GUIDE-
If you own a Toshiba Qosmio laptop and you are having problems with it powering down for no reason, try this.
1) Unplug all the wires and remove battery
2) Hold down power button for 30 seconds
3) Plug everything back in and start it up
4) Hold F2 to enter boot menu
5) Go to the Advance Tab
6) Set Execute Disable Bit to Not Available
7) F10 to save and exit
 SO FAR SO GOOD!

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