FireWire drives don't mount

Hello everybody,
my trusted LaCie 500GB and 250GB drives worked flawlessly since I bought them. Since two days they are not mounting. About a monthe ago I upgraded from 10.3.9 to 10.4.7. Everything worked fine.
I very frequently repair permissions and use Onyx for maintenance of my computer. I reset PRAM and VRAM. I did the power cycle suggestion, turning ewverything off, unplugging all devices, unplugging all power supplies etc.
All to no avail.
My system.log in console reads every second over and over again:
... -Computer kernel[0]: AppleFWOHCI_AsyncTransmit::waitForDMA - context not going inactive.
My console.log continuously repeats:
...-Computer root[175]: [MAFL] attempt to make FSSpec for "121-210.cypress" failed -120\n
...-Computer root[175]: [MAFL] attempt to make FSSpec for "210.cypress" failed -120\n
...-Computer root[175]: [MAFL] found no firmware to load for 210\n
Is there anyone who can help me, please?
I am at the end of my knowledge.
Thank you!

Thank you again for your reply.
I did try the HD on my friends older PB and all was fine.
Resetting the PMU did not solve the problem.
All other applications (but Logic, because I could not access my files) were running smooth.
Going back to 10 a.m. yesterday, basically starting over, there was one thing I missed checking: the AC to DC converters supplied by LaCie for their drives.
Voilá! Individual testing revealed, that the AC/DC converter for the first LaCie drive in my chain did not spin up any of my other six LaCie drives (which I never run all at the same time).
Changed power supply and now I am back to the fast speed and glitch free system I love. Back to enjoying work as well
Thanks for your suggestions. I appreciate them very much.

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