How do I slow my mac mini (2007)'s 5501 rpm fans

Hi, I have a old 2007 mac mini that I recently had taken to best buy to upgrade the ram, after the upgrade it is always loud and Istat says that the fan is at ~5500 RPM and another mac (which is silent) says only 1800 rpm under the same (and higher) workload. the loud mac has temperature of (according to Istat):
hard drive:81 degrees F
CPU: 94 F
CPU Heatsink: 83 F
Northbridge 1: 85 F
Northbridge 2: 81 F
the computer is cool to the touch
Please help me slow down the overactive fan on this mac, ~patrick

I have no idea if they removed, damaged or just forgot to plug the sensor back in. You really should take it back and make whomever worked on it fix the problem.
If you want to look at the teardown yourself, see > Mac Mini Repair - iFixit
Also if you do not feel comfortable with the service you received at BestBuy, report them to Apple and take it to another Authorized Apple Service Provider or Apple Store.

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How do I slow my mac mini (2007)'s 5501 rpm fans

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