I am having issues with my iMac recognizing an external drive. I have:

iMac 5,1 10.4.11, Intel Core 2 Duo 2 GHz, 1GB Memory, PIONEER DVR-112d in a BYTECC ME-525U2FW Aluminum External enclosure connected through Firewire.

The iMac initially recognized the drive, no problem. Trouble is, when I turn off the drive and then power it back up, the iMac can't recognize it. I was able to solve it initially by powering down the drive, unplugging it from the firewire, reconnecting to firewire, and the powering up the drive again.

System profiler states all software up to date.

Drive is functional, however it's not seen in finder the way the My Book external hard drive (through USB) shows up on the list.

Any suggestions would be appreciated. Thanks!