Dell studio 1555 shutting down while playing games

[mrbig89]

System specs :
-Windows 7 ultimate x64
-formatted before, original installed OS was Windows Vista
-OEM
-2 years approx.
-1 month since the last OS installation on this laptop

My dell studio 1555 keep on shut down by its own, something like power out without notice while playing games. This has happened for around 1 years time, but I still haven't found any solutions on it. Hopefully you guys can help

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[mrbig89]

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[roban]

I would suspect heat as the culprit.

 

[mrbig89]

I would suspect heat as the culprit.

Hi bro, initially i thought the same as well, and i tried to clear the dusts on the cooling fan inside my laptop, the heat do decrease quite a lot, but still , power offs still happens.
And i tried to reformat my laptop, and it did not help as well. What's going on actually?