External Firewire HD won't mount after Connecting to B&W w/ bad Firewire

I've tried and tried to find the answer, so finally I post...
I've had two external Firewire Laptop HD enclosures become unmountable after hooking them up to a 400 Mhz powermac G3. This has been 6 months apart. I used to use the Powermac B&W ... I know the Firewire worked at one time, but cant remember if it was before or after I added a Belkin USB 2.0 PCI card.
After clean installing... 10.3.2 .... no Classic... I hoped it would wake up the Firewire, did not. So hooked up the external HD to the USB.... it worked. Then, went to the eMac and via Firewire hooke up the same external HD.... it worked.... for 2 hours. Disconecceted, reconnected and like the other one...... no more mount. Not in classic, not on any comuter. If I daisy chain it to another Firewire external, the About this Mac no longer recognizes info on either. Once removed, the computer recognized the info the good one. Disk Utilities does not recognize harddrives in the enclosure... I put a different HD inthe enclosure.. still not mounting
It spins and receives power.... but no mount. Is this firmware? The hard drive is not corrupted... I put it into a mac mini and was able to extract the info... but what has caused this B&W's fire wire to go, and caused 2 of my externals to go as well....
Help.
Mixolidean

try the following to reset the ports:
1) zap PRAM - reboot holding down Cmd-Opt-P-R and left the machine boot cycle 3-4 times
2) reset Open Firmware
reboot holding down Cmd-Opt-O-F
at the screen type <reset-nvram</i>
press Return
type reset-all
press Return
3) disconnect ALL devices from the computer
unplug the computer from the wall
let it sit for 10-15 minutes
plug back in and reboot

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~
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~
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