Anyone know the size of the fan in the top of the base?

i need to know for replacement purposes. thanks in advance. also, what is the thermal paste all about? where do i put it? why?

The fan model number is 922-4677 (I believe). I have the instructions saved as a pdf if you would like. I originally downloaded it from http://www.whoopis.com/computer_repair/ but the site seems to be down today. Let me know if you want the guide.
The thermal paste is needed in order to transfer the heat properly in the computer. Because the processor is in tight quarters it can get quite hot. There are some metal posts that help to conduct heat out from the processor. If you do not put thermal paste between the two posts, they are unable to transfer the heat properly and you risk frying your computer. Any electronic shop (radio shack) will have this paste. I don't think that it makes a difference what kind you use (I bought the inexpensive silicon one). Just make sure that you apply it generously so that it does in fact help the heat to transfer.
Again, if that site doesn't come up, let me know and I can send you the pdf. It's not exactly an easy task to get at the fan, so you definitely need a good guide. http://www.whoopis.com/computer_repair/ has great guides (when it's running)

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