need some help please.

More info here:


http://support.apple.com/kb/HT1509?viewlocale=en_US&locale=en_US


There should be a download link, but you need to run the tests from an optical copy....this usually means the original SL disks....Apple still sell them, but they aren't cheap.

I guess you have re-set PRAM, and performed a SMC re-set too? Worth trying if you haven't:
http://support.apple.com/kb/ht3964
http://support.apple.com/kb/ht1379

 

To help with troubleshooting, I would suggest removing SMC Fan Control. It only affects minimum fan speed, so if the system requires a higher speed, it won't have any effect. IMO, it's mostly redundant, as the system will set the best speed for a good balance between cooling and noise.

When you say you've "done all the other resets" does that include SMC?

Procedure:

Check for processes chewing up CPU resources (causing high temps) using Activity Monitor. Be sure to set it to display "All Processes".

Snow Leopard is only available on disc. I believe it's still being sold by Apple; check with other resellers too.

Unfortunately, if the drive was erased when SL was installed, you will need to run AHT off the disc (gray one) that shipped with the machine.