Well, they are asking what to try. There’s nothing wrong with being out of ideas or not knowing where to start. Nobody knows everything.
SEs are not usually beyond repair but as has been mentioned, there could be several causes to the Sad mac error and opening it up will be worthwhile.
Caps are rarely visibly leaky on a 512k; they are more likely to be dried out on a worn out/heavily used analog board.
Heat/changes in temperature affecting the solder joints is one of the biggest causes of problems on these analog boads, but also specific component failure as well as worn out...
As the original post was so long ago, a few of the links are broken. Where would I find the ROMs of the other cards? Is it as simple as a ROM swap/reprogramming the ROM with the one from the X variant of the card to enable the higher resolution?
Another excellent write-up and documentation of a piece of history that would most likely otherwise be lost to time. Thank you! I hadn’t seen those A/UX specific model stickers before.
eBay doesn’t allow links in descriptions.
This is the buyers problem. They are buying a 30+ year old computer so most people will get that it may have either a dead drive or no drive at all. It’s up to them what they do with it. Just say it comes without a hard drive but there are modern SCSI...
Do any chips get warm or hot when it’s running?
Does TattleTech see it?
Agree with Byrd, start with a visual inspection - post some high res pics here as other eyes can help spot potential problem areas.
As Phipli says, to get this working reliably, remove all the possible complicating factors. System 7.5, 7.6 or 8.1 are probably good places to start. It sounds most likely to be a software/OS configuration problem rather than a hardware one in my opinion. I agree to not test with OS 9, it is...
The link you posted there is broken, can you post it again? I’m curious to read if Apple really touted a 15 year lifespan as that seems very unlike them, even for back then. I’m assuming it was just something done as part of the design but never mentioned on the marketing/sales side. It’s...
Welcome to the forum.
That’s a good price for an SE. The maximum RAM it could have is 4MB unless it has an accelerator board but that’s unlikely, though not impossible.
In terms of OS, System 6 is best for these. In terms of software, look at Macintosh Garden.
In terms of a hard drive...