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The XB prefix would potentially mean that it was a CTO. As an example my iMac 27 mid 2011 has the DG prefix. It was not assembled in Cork, Ireland. This is a guess but CK usually assembles machines that are not CTO but perhaps they do take care of CTO's as well under some circumstances. The rest...

From the service manual which only shows steps that you may or may not have done. I would be inclined to suspect the caps, they may not be obviously leaking but they should be replaced in my opinion only because they are old. Measure the battery voltage. I strongly believe it is not required...

from terminal try drutil eject (doubt it will work) Do you here any attempts by the drive to eject at all or is it dead silent, if so check the cabling to ensure everything is connected correctly.

Your Mac is too far from the router which I strongly believe is connected via WiFi. It is also possible that the extender is too far from the router or your Mac is too far from the extender or both. Bring the extender closer to the router as a first step. It could also be that there are other...

Let me see if I understand. You believe you might have caused a short to your 512K logic board. You also believe that although this logic board when wired up works as expected but drives the 400K drive to only move the head a short mm or so. A second working 400K drive exhibits the same issue...

As for cleaning and retrobrite. Believe it or not isopropyl can get rid of stubborn spots BUT it will also add a shine to the area if you over work any particular section so you might want to dilute the isopropyl alcohol. Of course first use detergent and a soft brush. Scrubbing with anything...

So here is the latest. I tried and tried and I've given up hope. This does not mean it can't be done. It just means that in my case there is something about the roller that won't grip the disc hard enough. I've cleaned the rubber roller to an extreme and added thin but very strong double sided...

Night Stalker, tried that, it doesn't work. Nothing powers up at all. 

So I have the drive mechanism open again. I am manually moving the gears to simulate disc insertion and ejection. The robber roller and the old belt are very good at gripping the disc, the problem actually is strongly pointing to the magnetic ring. It appears to be a barrier of entry and exit...

lob, I meant lubricant. I replied to your message first thing in the morning hence the typos and what nots.

@JDW thank you for your reply and advice. I sincerely appreciate it. It sound complicated even though you explained it very well. I simply lack the background knowledge and experience take your comments forward to a practical set up. I may just work around the issue by reducing the hard...

I was tempted to suggest you replace the voltage regulator as well. I haven't on mine but I may very well do it even though the machine hasn't exhibited any issue with only a cap replacement...

toothbrush, run isopropyl alcohol over the board after you do your brushing and it will push water out and isopropyl alcohol dries pretty fast, still let it sit because if ANY water isn't dry after the alcohol wash you might not be happy.

Wonderful, my 950 had a cap blown in the exact same location, got it that way second hand. Replace the cap and you should be ok. Do have details on the cap you need or should I open up my machine to check for you?

Today I took the machine apart again. Firstly I noticed that the replacement drive belts I received from China were slightly thinner and were much more rubbery, softer, not sure how to put it. Now, I didn't yet replacement the best because the roller, pictured above was not spinning with the...

The board should be cleaned. This is what I do first, preferably with an ultrasonic cleaner. Once cleaned I would move on with a more in-depth visual inspection. Do you have or know someone or a business who can clean the board. I have a 950, big board, it's going to take a large ultrasonic...

Quick update The belts arrived but I foresee some challenges with resolving this with only a new belt because the roller appears to spin independently of the shaft, this as per what I had documented above. I will confirm this and report back.  I have some explaining to do … Sorry for not...

I am going to suggest it. Have you tried to kill preference files? Darn it, if possible boot from a zip with a clean install. All you need are the zip drivers on the zip and it should boot (if memory serves). Otherwise try to boot from some floppy. A simple damaged file, like a preference...

Thank you James. Indeed I removed it but then began wondering, hmm this must be hear for a reason. Never learned about it but I am pasting you answer here: