Hello: I've got two Western Digital 80 GB drives (2MB cache) on a Sonnet Tempo RAID 133 card, in my Dual 500 G4. They are raided together, and NOT used as a boot drive. Sometimes when the computer has been on for a while (it gets warm in there), when I restart, I get the spinning wheel with the grey Apple, and then the 'circle with a line through it' no-go. Once the computer has sat shut down for awhile, everything boots up fine. I believe the OS goes through a system-wide check before continuing the boot sequence, and it sees something funky about those drives (this never happened before I installed the RAID array). Anyone have any ideas whether it's the heat, some kind of 'time-out' with the WD drives -- or the Tempo RAID card acting up? If you're running a similar config, your help would especially be appreciated. Best, JIM. OS 10.2.4, 1 GB RAM, Dual 500... -- JIM BLOKLAND jim at blokland.com http://www.blokland.com