Another iMac Temperature thread

iMac 24" 3.06Ghz C2D w/4GB Ram. This is not the machine in my sig.
I've been getting hard freezes and difficulty starting up after these hard freezes. I'm starting to suspect temperature related issues.
I get the freezes when pushing the machine hard with either Aperture or Photoshop. The machine will hard freeze. I'll reboot, it'll take longer to start up than normal (probably doing fsck or something like that) but then when it gets to the login screen I'll be able to move the cursor but not select anything.
I'll play this game for about 5 minutes before it lets me back in. When it does finally let me back in the fans will start up at a high level, higher than they were before the crash and startup folly.
Here is a screenshot of the temperature readouts from iStat menus. http://bit.ly/gipan5 These seem high to me and the upper left of the machine is too hot to touch. Apple has already replaced the logic board on this machine once for what seemed at the time to be a USB issue.
Can anyone confirm that these temps are either high or within operating spec?
Thanks!

If those temp are Fahrenheit the are well within specifications. It would be useful to know how much RAM the machine has and how much of that is Free. It would also be useful to know the results of running Apple Hardware Test in extended mode.
To get how much Free RAM it has please run Activity Monitor (Applications - Utilities - Activity Monitor) - click the *System Memory* tab and then let us know what values are in:
Free
Wired
Active
Inactive
Used
To run Apple Hardware Test in extended mode please click the link for instructions. If you get errors please post the error codes.
Roger

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Hard Drive 92 deg. F
CPU 85 F
Ambient Air 69 F
GPU Diode (graphics card) 92 F
Hard Drive Bay 95 F
Memory Controller 90 F
Optical Drive 81 F
If you have iStat Pro and see that your temps are about the same as these, I would say don’t bother to read further – you may have a different set of problems. If your temps are 10-20 F (or more) higher, keep reading.
2. Try to clean out the internals of your Mac with compressed air. After 3+ years of use, I used an air compressor with an air gun attachment and blew through the vents at the back and bottom of my Mac with 60-80psi and actually saw a cloud of dust come out of my Mac. A more effective approach would entail cracking open the case of the Mac so you could really blow directly on the different boards/components. I haven’t done that, but I’m tempted to give it a try. Note: Some have suggested vacuuming and/or using a can of compressed air. I don’t think that approach is all that effective. You need a really strong flow of air to get that dust out of the inards.
3. Download the free program SMC Fan Control (v 2.2.2). It will allow you to adjust the fan speeds higher for each of the 3 internal fans. The Mac has firmware that ramps up the speeds of these fans as internal temps rise, but the general consensus is the Mac firmware is “too little, too late”. With the standard Mac firmware, the fans will run at their default settings well beyond the point where the components are already way too hot. SMC Fan Control allows you to set the minimum fan speeds higher than the Mac default.
Once you've done these steps, I'd suggest doing a SMC reset, then re-boot while keeping your fingers crossed.
This is getting too long so I’ll stop for now. Good luck...

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