it could be a number of things... a dirty fan... dirty heatsink... the fan isn't working correctly...
have you taken off the cover to see what the heatsink looks like or what it seems to be doing... ?
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P4 3.0ghz , P4M900-M4 , 450 psu , Sapphire HD 3850 512mb with an Accelero S1 cooler , 2gig pc5300 ddr2, 80gig Deskstar , 16x dvd-rw
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