Hi, guys! I have an issue with my oldest Apple Machine. About a week ago a few apps wont start. Also the booting time was about 3 to 5 minutes. And it had a noise, like something was forcing hardware up to the limit. Although Activity Monitor said that the Processor was at least 50% free and the RAM had at least 1 GB free. I test the HDD with Disk Utility but i got no errors. Then i test with Apple Hardware test (normal test) and everything looked good. The i thought that it was full of dust and i should use a vacuum to clear the dust. I opened the iMac i disassembled almost every part, beside the mainboard, then i put everything together. When i tried to start it, it did not boot. I used the original cd, i test again the hardware, this time with extended test, everything was ok. Then i opened disk utility and i had a surprise: the hdd was not there. Now, i removed the HDD, and i gave it to a friend that will test it if its ok. I need some opinions. Thanks!