Hi all, My early 06' Intel iMac (1.83 ghz / 2MB RAM) has been getting noticeably more noisy in the last couple of weeks. Not the fan.. but the hard drive - which seems to be more 'crackly' and audible... and seems to be doing stuff even when I'm not using the computer. I have used Disk Utility to run a verify but there are no errors... and I have some 40GB free space. I haven't installed anything at all in the last 6 months. I also ran Techtool Pro 5 - a SMART check passes OK. Could this be a precursor to some HDD fail ? Is there anything else I can check ? Thanks.