I was using my early '08 iMac earlier, specifically browsing albums in iPhoto, when my iMac crashed Windows-style (everything froze except the cursor). I've never experienced anything like this before on a Mac. Nothing has been installed recently and as far as I know, it has never had problems before. I decided to run the hardware test in both modes, which came back as fine. However, upon experiencing a few more slow downs, I decided to run TechTool (updated to 3.1.3 for SL), which produced a result of 'failed' for the Volume Structure. To confirm this result, I ran the test three more times, all of which reported a failure while running, though, oddly, the last said 'passed' in the report (despite saying failed on the actual run). I've since repaired permissions and reset the PRAM, but still nothing. Bizarrely, TechTool's contradictory reporting has continued. Console is also reporting some unusual messages such as 'disk0 ioctl' and 'kernel 0x00000000' (the former frequently and the latter after the crash). As far as I can tell, the iMac has returned to running reasonably smoothly, but I fear these are the first signs of a HD failure. If this is indeed the case it really couldn't have happened at a worse time, as by the end of the coming week it will be essential that I have this computer available. Inconveniently, Apple support for computers is unavailable on Sundays. Also, the computer is indeed covered by Apple Care. My questions regarding this are as follows; -Am I correct in my assessment of the possible issue? -If so how do I approach it with Apple? Are they generally sympathetic to time constraints? -Any further advise? I would appreciate any help greatly. Thank you.