Suddenly Mac mini won't "see" external drives. Possible related to OS software update to 10.6.8?

Suddenly Mac mini won't "see" external drives, neither Firewire nor USB. Possible related to OS software update to 10.6.8? Worked fine under 10.6.4. Any advice? Thanks.

Turns out it was nothing to do with the OS update, it was just a loose cable plug connecting my FireWire/USB hub to the computer. But your tip is a good one -- I'd been wondering why the external drives (even when mounted properly) weren't showing up in the sidebar. Thanks!

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