After 10.5.6 Update, external drives no longer mount

For some time, I have been using a Western Digital external drive for my Time Machine back-ups. Sometime after the 10.5.6 upgrade (Dec), When I plugged in the drive I get a "USB Over Current Notice: A USB device is currently drawing too much power. The hub to which it is attached to will be deactivated."
I assumed the drive had failed, so I bought another drive (A Verbatim). It mounted fine, so I formated it to use for my Time Machine back up and it then it immediately refused to mount once it was reformatted. Neither drive will mount, though other USB devices like memory sticks mount fine.
There is a discussion strand about a problem in Time Machine after the 10.5.6 upgrade, however, all the fixes posted assume that the drive will mount and you can then use the Terminal Application to repair a damaged file on the external drive.
I'm stuck. Any advice?

Bradleysp wrote:
For some time, I have been using a Western Digital external drive for my Time Machine back-ups. Sometime after the 10.5.6 upgrade (Dec), When I plugged in the drive I get a "USB Over Current Notice: A USB device is currently drawing too much power. The hub to which it is attached to will be deactivated."
Is the drive attached to a powered hub? Bus-powered drives often cause this problem as they start to fail. Des the drive work if attached to your MBP?
I assumed the drive had failed, so I bought another drive (A Verbatim). It mounted fine, so I formated it to use for my Time Machine back up and it then it immediately refused to mount once it was reformatted. Neither drive will mount, though other USB devices like memory sticks mount fine.
Again, the hub question. If you are using a powered hub perhaps its power supply brick is failing.
There is a discussion strand about a problem in Time Machine after the 10.5.6 upgrade, however, all the fixes posted assume that the drive will mount and you can then use the Terminal Application to repair a damaged file on the external drive.
I'm stuck. Any advice?
One step at a time
Luck-
-DP

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