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Or you can just make a custom new PICO based PSU replacement: Scroll down on page 3.

Here is the stuff I used. The solder core with that rosin work way way better than what came with the solder iron. Before you apply the rosin, dab some 99% Isopropyl Alcohol to clean off the area, then dab some rosin paste on the area and apply some solder before setting the cap. Also make...

#1 I ruled out buy connecting the caps from the working board to the non-working one with some wire clamps. The CPU being as hot as it is is going to be fine when idle. Under load for a long period of time it may not be (as is the case with ARM chips in your phone etc). My concern is these...

Also just a tip. If you need to convert an ATX 20-pin to a 10-pin you can also just use a PICO PSU to embed the PSU directly into the Macintosh computer as they're super small. Something like this would...

Did a quick clean of the new motherboard. Everything works except for the scsi. I know the hard drive and cable are fine as it came from a working computer. Might need to replace the caps if thats the issue.

Made some directions for making a Macintosh IISI PSU very quickly. Based on a YouTube video but simplified. 1) First buy one of these "24 Pin to 10 Pin" off Amazon or Ebay: https://www.amazon.com/gp/product/B07C5P5H2L 2) Rewire it with the image below. More info and reference...

Ok just got another Macintosh IISI motherboard. It works perfect with my custom ATX PSU! Still need to wash the motherboard but its sound is still strong so caps seem still ok. The custom ROM SIMM doesn't solve the problem on my old board (so ROM SIMMs are not the issue). But now I can compare...

Still waiting on other motherboard (which has black memory slots). Just got the custom ROM SIMM in the mail today so haven't tested yet. Will report back once I do.

That would be nice if there is a General category form area? Create and link it.

One other note. Waiting for mail. Got a custom ROM SIMM from BigOMessOfWires to see if a custom rom skips some error the stock one is having. Also got another motherboard from Ebay that doesn't need a ROM SIMM to see if I can get that one working.

I didn't find any traces I could see. Did a test of leaving it on for 30 min to see what chips get hot or warm. CPU seems to get pretty hot when you leave it on doing nothing. Not sure how hot a working one gets when its left on. If they don't normally get hot that might be an indication of...

I'm also open to some type of group action (I just want my stuff back or him to respond or update his site to explain delays). Whats the best way to deal with this. Give him a group warning that we will be reporting fraud to his local authorities or what? What is the normal or best way to deal...

@9166188 Did your motherboard have a ROM SIMM? Mine does which I read was rare. Wondering if yours is the same? If so wondering if the versions with ROM SIMMs have this issue.

So I converted an ATX PSU to work with the 10-pin Mac PSU type. The computer powers on but has the same issue. At least I know its not the PSU that causes this issue. I might post back with good instructions on how to convert an ATX PSU to work with Mac II(SI/CI). Its pretty easy if you have...

I'll post back here if I get any response from him.

So I've decided to try and use a normal ATX PSU using one of these adapters (24 Pin to 10 Pin Power Supply ATX PSU Adapter Cable): https://www.amazon.com/Asicminer-Power-Supply-Adapter-Cable/dp/B07C5P5H2L I might need to swap some wires, not sure until I get it but seems like a logical test...

No still no reply from any email. This pisses me off, those Mac II/SI PSUs are impossible to find. I just want him to send it back so I can do it myself. (I spent over 100$ for this recap) I was thinking of filing a fraud report as well. Could you PM me his new office location if its known?

Did you ever try this: 

So maccaps.com guy "Charles Phillips" is not responding to any of my emails and its been 3 weeks. I sent him my PSU 3 weeks ago. Messaged once after two weeks to see what an ETA might be... he didn't respond a week after. Also emailed him yesterday and still no answer. Is this guy still alive...

"About the PSU, how do you open it up?" -- You take off a screw or two then slide the top off. After that there are screws inside behind stuff... its such a dumb design.