Fan won't stop running

Early 2008 27 inch iMac running latest version of Lion.
I had a hard drive that kept corrupting files (not the original HD, been replaced once by apple) so I replaced it with a new (ish) 1 Tb WD green.  But after I did this my fan won't stop running.  I thought I had disturbed the HD temp sensor so I opened it back up again and made sure it was properly on the HD closed it but still constant fan.
from istat pro I'm getting readings
HD  37
CPU  29
CPU heatsink 28
Airport Card 30
GPU heatsink 33
HD Bay 38
Mem Controller  29
Optical Drive 30
All my temp values are there, so I assume my sensors are fine.  I don't have AHT as I don't have my original install disks (I lost them somewhere in the last 7 moves between houses)  I already tried resetting the SMC.
Can anyone tell me if these readings are normal?  Are any high that would be causing my fan to stay on?

Um, OK. I've just realized that the fan isn't running any more, and I've been using it for a couple of hours. I'm not sure if I should do anything else or just not look a gift horse in the mouth. Anyone have an opinion?

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