Just installed 10.6.3 on MacBook Pro and external disks cannot be seen by OS.  Help

i installed 10.6.3 on my 17" MacBook Pro (updating from 10.5.8).  All my external disk drives which had all been visible to the system and accessible before the update no longer were visible to the OS. Not in the sidebar and not in the disk utility. After checking all connections etc. many reboots, resetting the pram i still am unable to see or access these disks.
From there i updated to 10.6.8 but exactly the same results. i'm not sure where to go from here. i have 4 externals on 2 different  usb routers and 1 external on a firewire router.
I'm considering removing the routers and trying each drive separately and directly connected to the laptop.
And of course, i'm short of time.
Anyone with similar problems and/or solutions?

You mean USB HUBs, correct? Not routers.
Yes remove the HUBs and try the drives connected directly to the computer.

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