Hard disks on secondary ATA channel disappeared!

Probably just a coincedence, but after upgrading to 10.4.6 I seem to have lost 2 drives in the Mac. Any suggestions about how to troubleshoot this? In a PC I would be able to go to the system bios setup to find out if the problem was the dirves or the board. Not so in the Mac. Any help would be greatly appreciated.
G4 Dual 1.25 proc Mirrored doors   Mac OS X (10.4.6)  

Hi
You can open Disc Utility & see if the drives show up unmounted. If so, they can be mounted from there.
You may also want to install the Combo 10.4.6 update, as sometimes glitches arise from running the delta updaters...
Zapping the PRAM will do a hardware reset, in case the issue is actually not directly related to the OS update.

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