Edit. Hang on!
Yeah apologies for the the message previous to the edit, I didn't see what you'd written in the Rep message.
Firslty what are you using to monitor these temperatures?
OK. So, don't worry about opening the case! If you are careful, nothing bad is going to happen. Although there are sensitive parts, the inside is far less fragile than what your average user thinks.
Firstly, you can just have a look. May not be necessary to do anything now. Although I'm betting if you haven't opened it before, It's going to be pretty dusty in there. So, turn off your computer. On the back where the power cable is, there could be a power switch. Turn it off if there is. If not, no problems, just switch off at the wall and pull out the lead.
Next lay it on it's side. Open the side of the case. Nothing to break so far, don't worry! Have a little look around. Just don't touch anything inside. Although if you must, keep one hand on an UNPAINTED part of the case, or something else around you in the house that will keep you grounded. There are also static wristbands for the purpose, but many just do what I said before.
That's your motherbaord. Where the white socket is, is your CPU incase you didn't know, and the cooler is on top of that. Usually a heat sink with a fan on, or it may just be a heat sink.
How does the dust look on this? If it's pretty bad, you could go online and buy some compressed air. This is used for cleaning inside, and is preferred as there is no moisture inside the bottle. Don't use a hoover as there could be a risk of static. However if you wish to spray the air, and then hold the hoover above the case slightly and aim to direct the dust into it, that's completely fine too.
If you wish to take this on step further, you could re apply the thermal paste. This is the substance between the bottom plate of the Heat Sink, and the top of the CPU. It acts as a bridge to compensate for the inconsistency in flatness on the 2. And is a much better conductor than Air.
Sometimes over time this substance can become less efficient, or it may have not been applied properly in the first place. Re applying it can sometimes be beneficial. A small tube of this can be bought for $5 or so... It will last ages as you only need a blob smaller than a pea. If you wish to do this, search the forums closer to the time...
Lets see how we get on with this first!Edited by Dom_sufc - 1/16/10 at 7:33am