Problem after upgrading to Snow Leopard from Tiger

Hello all!
I have an old macbook pro 15" purchased on 2007. It's model is macbookpro3,1 and it runs Mac OS X Tiger 10.4.11. Recently I upgrade the system to Snow Leopard. Everything seems to be fine except the laptop runs much hotter.
At first I don't know why but then I found out that on the Energy Saver menu, there is no options to select between the intel onboard graphics card and nVidia 8600M GT. And it seems the system selects the 8600M GT as the default card, therefore my GPU temperature is always about 60 Celsius degree.
Another problem is the Airport card is also hot, it's always about 60C degree (according to iStat Pro)
So anybody has same problem with me? It'd be great if you could help me figuring out these issues.
Thanks a lot!!!

TonyHeli wrote:
At first I don't know why but then I found out that on the Energy Saver menu, there is no options to select between the intel onboard graphics card and nVidia 8600M GT.
Are you sure there is an Intel onboard graphics processor in your MacBook Pro? AFAIK, Mac laptops do not have multiple graphics processors -- MBP's have a single fairly powerful one with dedicated video memory & regular MacBooks have only a somewhat less powerful one that use shared system memory.
For example, the MacBook Pro (Mid 2007, 2.4/2.2GHz) Technical Specifications make no mention of an Intel GPU.

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