Lenovo G770 Fans not working

Contrary to everyone else's problems here my fans just not seem to be working anymore or something. I have switchable graphics with an integrated Intel and an AMD 1gb dedicated graphics card. When I switch to "high Performance" my lap top gets so hot, around 91 degrees Celsius. But when I switch to Power saving it stays a bit cooler. The trick is that I don't even hear my fans working most of the time. While playing SC2, a few times I've heard the fan go off(pretty noisy) and it cooled my computer off really fast. But most of the times it just builds up the temperature and becomes choppy as hell. I don;t remember it being this bad at first, but it seems that it has some kind of an issue now.
Pleae help, I'll try to download the latest drivers now, but I think I've already done that. 
Solved!
Go to Solution.

Sargeraspa,
Lenovo G770 has ThinkVantage System Update? I thought that is suppose to be for ThinkPad system only?
Go to the link below and Select Win 7.
http://support.lenovo.com/en_US/research/hints-or-tips/detail.page?DocID=HT072970
Then update the BIOS and Energy Management driver.
*Non Lenovo employee*
I have a Y2P (i5) ... Feel free to ping me if you want me to test some applications with your Y2P if you have the same model. I don't mind keep doing recovery on it if needed .... =)

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