Snow Leopard, iMac Temperature and Fans?

Since getting my iMac eighteen months ago I have checked the temperatures regularly.
Unfortunately I did not write them down and cannot remember what the highest "normal" temperature was, though the hottest place was always the "Power Supply Position 1".
One thing I am certain of is that I thought the 3 fans just had one set speed because every time I checked the Optical Drive was always around 699rpm and the HD and CPU fans were always 1199rpm.
Until a couple of weeks ago I had not updated the original OS which was 10.5.2, but then I updated to 10.5.8 in one go and last week I upgraded to Snow Leopard 10.6.1 by installing it over Leopard.
Today I was doing some simple editing in Final Cut Pro for an hour and checked the temperature.
The Power Supply Position 1 was 176 degrees F. I can't be sure but I have a feeling that I have never seen it above 169.
I then put a 20 minute video in Compressor to encode and the temperature rose to a maximum of 179.6 and the CPU fan was around 1500rpm which I have never seen before.
Has SL had any effect on temperatures or fan speeds?
Are these figures normal?
My room was only 66 degrees which is fairly cool.

Thanks K T and Pondini.
That's really what I was looking for Ikrupp, some figures from other users under moderately intensive operations (not writing emails!).
Yesterday, when I had finished using Compressor the temperature started dropping from almost 180°F and when it reached 176°F the fan had also dropped to 1199rpm so it looks as though it doesn't speed up until the temperature exceeds 176°F.
It appears that your figures are pretty close to mine. However, if others could give me figures they get under moderately intensive use, it would give me final confirmation that all is well (or not).

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Snow leopard logs out and applications crashing

I replaced hard drive in macbook and decided good time to upgrade to snow leopard. well now with clean install on new hard drive snow leopard randomly logs me out and i get a blue screen flash then end up on log in. it does it on regular log in and safe mode. It also does it with aftermarket 4g of ram and apple 1g of ram that came with macbook. Also before it logs out if im in safari it keeps reloading the page almost everytime i touch the track pad
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using 10.6.8

Solved.
Hardware test said everything was good. I ended up using imac at home to make bootable usb drive of snow leopard. installed that and got same results. finally someone suggested redoing partition since i did original partition on the superdrive in macbook. New partition, clean install and everyting working great

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a. so how can I un-write-lock Macintosh HD?
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a. it looks like my Macintosh HD is write-locked. Can I still use Carbon Copy Cloner to copy all data from Macintosh HD (in target mode) to my external hard drive?
b. will my computer allow me to erase (or format) Macintosh HD?
c. will my erased/formatted Macintosh HD able to install + be installed Mountain Lion OS?
If you are here, then you have read my long long problem. Thank you very much and I would really really really appreciate your answers and opinions. Thanks

I'm not sure where you read that about the disk being "write-locked." That doesn't make much sense, given that the major task an installer like this must achieve is writing a whole bunch of files to the hard drive. I think your source was mistaken.
As to what happened, it sounds like your hard drive was badly corrupt to start with, or possibly was on the edge of failing and is now in the process of dying entirely. If you don't have backups of your data, that does not bode well for you, unfortunately. If you can manage to use target mode to copy your data, do that.
Once you're sure you've got all your data, you need to start up from your Snow Leopard install disk and repair the hard drive. (Since it sounds like the Mountain Lion installer didn't work, I wouldn't trust the recovery partition that Mountain Lion installs.) Or, even better, just erase the hard drive entirely and reinstall Snow Leopard. Then, once you're back up and running, with all your data back on the system and with Snow Leopard updated to the most recent version, try installing Mountain Lion again. If any of that fails again, the problem is likely to be a dying hard drive, and you'll need to replace it.

3 Beep when i try to boot Snow Leopard (after memory and sad upgrade)

Good night,
I have a Macbook Pro Later 2011 with Yosemite installed and today i tried to upgrade memory and SSD.
Memory: 16GB 1600MHz DDR3 (2x8) Corsair 11-11-11-30 1.35v
SSD: Corsair 120GB Sata 3 Force GT
After installation of my new gear, i tried to install OS X Snow Leopard through DVD and i get this 3 beep when boot start.
So i reinstalled the original hard drive, keep the new 16gb and started correctly.
Tried boot DVD again with the original hard drive and new 16gb but the 3 beep continues...
Then i removed the 16gb, but still doing this 3 beep stuff when i try boot from DVD.
I tried all combinations with new and old hardware but nothing more works...
I have changed the slots with both, the 16gb and old 4gb.
Could be the DVD corrupted?
Now im running my Yosemite with the original hard drive and the new 16gb memory without any issue.
Im already do the memory test nothing wrong appear in results
My configuration:
MacBook Pro (17 polegadas, Final de 2011)
Processador 2,4 GHz Omte; Cpre i7
Memória 16 GB 1600 MHz DDR3
Gráficos Intel HD Graphics 3000 512 MB
Could anyone help me plz?
ps. sorry for my english

The DVD's too old for that Mac. If you need to install an OS on it, connect it to the Internet and start it up with the Option, Command, and R keys held down.
(110037)

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Snow Leopard, iMac Temperature and Fans?

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