Problem with Time Machine/Finder not finding and (keeping) remote drive

I have a Mac Pro and hooked 2 Western Digital My Book 750GB drives via Firewire onto it to use as my time machine backup for the two MBP's in the house.
The problem I run into may be more network related than Time Machine related. I have the file sharing turned on in Mac OS 10.5.2. I am able to select Mac Pro in Finder on each MBP and then under that select my Time Machine drive. Then within Time Machine I can select the My Book as my Time Machine drive. At this point I have no problem using Time Machine.
Where the problem occurs is if I use Finder to browse other drives such as an Internal Drive I have in my MBP or my Mac Mini's drive it no longer can find the Time Machine drive. It just is like it loses sight of it somehow. All I need to do is once again go to Finder/Mac Pro and then select the specific Time Machine drive and then Time Machine is fine again.
How can I get around this? It seems i have to make some type of permanent logon or so to this drive.

1. try plugging in directly (think you did this already)
2. try a different cable - switch to the one you know works.
3. try a different port on the case.
4. does the faulty one power up at all? can you hear the drive spinning?
5. try switching to the good power adapter if you are not seeing action under #4.
there may also be a reset button on the board or case.
if these are not working, then the bridgeboard has died in the case. there is a board that the drive plugs into that gives you the firewire, usb connections, etc. the drive likely hasn't failed, you just need a new bridgeboard or case, as I doubt maxtor will sell you just that part. the drive can be pulled & put into another case.
check out macsales.com if you need a new case.

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