I am a new convert to the Apple world, using Leopard version 10.5.5 on an iMac and I'm having problems in two areas. (1) When turning the computer on for the first time in the morning the computer seems to be starting normally, but then the screen sometimes freezes before the accounts window appears (the screen remains blue). I force quit by holding the start button down, then turn the computer back on and have no trouble. This problem seems to be occurring with some frequency. I am wondering if this is a normal quirk of the operating system. If not, can anyone tell me what the cause of this behavior might be and how to correct it? (2) I have an external HD I use to back up certain files I work on frequently. The drive is connected via a Firewire 400 port. I turn the drive on only when I'm ready to back up. Sometimes the HD mounts with no trouble, but often it is not recognized and does not mount. If I reboot with the drive turned on, there is no problem. Can anyone advise me as to why the drive is not recognized when I turn it on?