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A bad job of applying heat sink paste could give that result. The G5s are hard to get right — I have done the job often, and have needed to repeat the process two or three times over the years because of high temps after the first go. So it might be worth pulling it apart one more time….

The eMate battery is easily replaced by buying one of these (or higher mah capacity), snipping the leads off a couple of inches long, and soldering on the wiring from the original battery...

It does not require a IIfx, no. I think much of the association with the IIfx is that the 24GC so nicely complements the co-processors/ controllers unique to that machine, in the 24GC’s having not only a Quickdraw processor but an actual operating system that boots up, running the Nubus card. A...

Cameron Kaiser. His name leapt to mind just as I pressed the post button.

As I recall, the fellow who developed TenFourFox had IIci cache cards fail regularly in a machine used as a server of some sort running 24/7. I think they may well be prone to failure, but if it turned out just to be two caps, well, that would be a good thing.

I think the Thunderstorm is just a DSP card, so no video out, but an interesting card for image work in a IIfx. Can’t comment on the others, except that none are especially high end.

Maximizing your RAM would open up interesting possibilities for booting and working from a RAM DISK, via Maxima or the like. Combined with memory compression software like RAM Doubler, it would then be possible to have a really large RAM disk in the Q650, allowing you to work from more or less...

I have recently moved and much of my mac gear is in storage. I still have a couple of machines handy, however, one of which is a Classic II. For reasons that need not detain us here, it happens to be a favourite. Now, it has not been used in a while. Last time I tried it some months back, it...

Sorry about that. That will teach me to rely on what I call my memory! It has been a long time since I touched the old gal, but i just dug it out to check. Shift-Fn-Ctrl-Power is the reset combo, apparently. I DO remember having to reset the machine occasionally, however, and that my backup...

Tried pushing the reset button on the back? Anything is possible, of course, with dying components et al., but the Wallstreet in my long experience of it (I used one as my main laptop for several years) was a model somewhat afflicted by GLOD. So yes, the backup battery (it’s not a pram...

I still have it (Spectrum 24/ V, as I recall), but we moved across the country last year and my stuff is still in storage, some of it being rather deep in storage, so I can’t really answer your question, Trash. Sorry. I am going to start excavating said storage and selling much of my old Mac...

Take some measurements with a calliper. I don’t know if rubber hose can be had in that small a size, but if it can, rubber hose slipped over and glued to the axles might work.

I think there ought to be a Bill Atkinson Award™ for longest and most profitable use of Hypercard, the inaugural winner being yourself. You are still using the same stack in the company that you designed in the 90s! That, to me, given the ephemeral character of computers and software, is just...

Actually, mine did have a tiny filter at the radiator intake, the filter being just a piece of nylon mesh in a cup shape, with a rim. It had clogged, and came out entirely as an obvious failure point. I forgot about that yesterday.

In the G5 quad cooling system, there are two little plastic inserts about the size of a pill bottle lid, with microchannels etched into them. In the disassembly/excavation, as I recall, they are next after the O-rings. (It is, by the way, reasonably easy to refill the system once they are out...

This may also help: A/UX will rebuild the kernel when each new (supported) Nubus card is installed, so that there is a delay on booting when you pop one in. “Patience,” as a four year old girl with a rather pious Catholic mother once told me, “is a birtue.”

This publication is the best I’ve found as a reference work for cards/ upgrade options for machines from the II and Quadra era. I’m pretty sure compatibility details will be in there. https://vintageapple.org/macbooks/pdf/Upgrading_and_Repairing_Macs_Que_1994.pdf

I had a P600 from new in the early 90s and recall that PDS cards were not routinely compatible between it and the IIci. I believe that some were, however, so a case by case approach is needed to avoid frying card or logic board or both. I do recall the latter warning clearly, which would imply...

I think we have to assume that pungent electrical burning smells are not a feature of the box you bought, so BAD things may well have happened. As for the dead ADC, those things are delicate flowers at the best of times. Do you have a G4 or the like to test it with? Take it apart and see if...