izzi based on the f/w version you see and combined to the "click sound" it is almoust sure that you have bad head(stack).
I will disagree to
pcimage in the part of drive having firmware problem

(
pcimage just look more carefully, and will understand what i'm talking about)
izzi about your questions:
1. IMHO here the problem is not software but hardaware related. Anyway I'm not sure "Maxtor Firmware repairer pro" will work with this drive and afaik even PCI did not support all SABRE drives.
2. Unfortunately I'm looking for same ....
3. No it is not possible, BTW upgrades are relased for those drives by the manufacture, but it have to be in working state to be able to upgrade it.
4)All pocker drives i have seen use one and same "safe mode" jumper
5)Yes, but if you need the data you have to be more carefull because if the heads are OK(hope i was wrong saying the opposite) you can damage them, you can damage the new board, and probably you can damage the spindle motor. In this case the recover would become even more difficult.
My advice is to take the drive to data recovery company at least for diagnosis.
Greetings