The fan on my 24 inch imac has become very loud

The fan started to get really loud. The finder crashes every once and a while and I get the message that tells me to hold the start button till the compuer shuts off, then restart

For the crashing/need to restart problem you may want to post the log here to see if anyone can suggest what the likely cause is. It sounds like you are getting Kernel Panics. You should be able to locate the panic report as described here: http://support.apple.com/kb/ht2546
For the loud fans, you could try an SMC reset, it might help, although it's possible there may be some connection between the events:
http://support.apple.com/kb/ht3964

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