Hey guys, go easy on me with this, I am NOT computer savvy in the least bit, I'm a mechanic and can teardown an engine but know virtually nothing technical about a computer. Here's the rundown. I have a G4 Quicksilver model M8667LL/A, Dual 1.0 Ghz, that I use at home. I believe it's running OS X 10.4.1, I have a browser on it and that's basically it. I use it strictly for email and web browsing, I don't do anything else with it like run anything big, I store all my data on an external hard drive so the machine is not over worked in the least bit. Recently it began to freeze up on me, requiring a shut down, once cooled down for a bit I could restart it but would get a 'restart' screen soon after. Once restarted a second time it would work fine but I noticed a considerable amount of heat coming from the bottom of the case. I downloaded Temperature Monitor and have seen as high as 116.7 F, obviously too hot. Both fans are working but don't seem to really move that much air, the aluminum heatsink on the top side of the door when opened is hot enough to cook on. I've emailed two local places for repair quotes, one told me my computer was outdated junk and not worth repairing, the other said it was an easy $50 fix, bring it in. I would like to get more ideas on this problem before doing anything, obviously $50 is fine if that will indeed fix the problem, I also considered throwing another stick of RAM in it while it was in for repair (it's a three slot, two slots have 512 in them) but if this thing really is junk I don't want to put money into it. Again, I don't run an office or have a ton of programs loading it down, Mozilla, iPhoto, and Adobe for PDF files is really all it has. I've searched around on here a bit for tips on repairing or diagnosing an overheated machine but didn't find anything common to my unit. Any thoughts?