For the second morning running I had trouble waking my iMac from its sleep, both times I had to restart when everything froze (eg was able to start Thunderbird, but then it seized up). Jeez, it brought me back to my Windows' days After restarting it this morning the hard drive has been grinding non-stop, which it never did before. I have loads of free space on the HD so that can't be the problem. I haven't added any apps to the iMac the last couple of days, only copied a DVD (that I own!) to the HD. Any ideas what might suddenly be causing the trouble? Thanks.