[ubuntu] HP dx5150 Overheat Issue

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http://ubuntuforums.org – I posted a while ago about an inquiry about potential ATI driver issues in Ubuntu as I was purchasing a pair of off-lease HP dx5150 PCs (circa 2005-06) for my nephews. Anyways, one of the machines works fine, but the other has occasionally overheated. I have exhausted all the possibilities: thermal paste, clean out dust (these were in a corporate environment, there was NO dust--it was just like new!), check processor speed, check the fan, etc. Needless to say: there was thermal paste, there was NO dust, the fan worked and the processor was clocked at 2.2 GHz, its normal "desi (Hardware)