Interesting. You had no corrosion damage. So I got mine to move from gray screen to flashing image by dishwashing the board. Personally I think the culprit is a CMOS chip on the un…

Interesting thread. I have a 3400c/240 too sitting in the closet. never could solve the problem... here is the thread if of some interest : https://68kmla.org/forums/index.php?/t…

Do you have any idea how I'd find out where the ADB controller is.  The mouse works better but sometimes it doesn't work at all.  I'll let it sit overnight again but that's not a g…

I think you may be right.  [it's worth noting I had removed and replaced (i.e. reseated) everything way prior to this so if there's a connectivity issue it's deeper or more latent.…

Check the HD and trackpad ribbon, connector and reseat all.  You need to reseat both cables quite firmly and ensure the latch goes down properly.  The trackpad is just an ADB devic…

For documentation purposes, the issue with the disk icon not popping u,p when the screen and cursor would, was located in a CMOS chip. Now I'm having problems with the HD port an…

Still does not read the trackpad

Lol. Disregard. No disk at all with CD module, flashing disk with HD, it booted from floppy [wrong OS, hence message]. At some point it stopped displaying the flashing QM. I let…

Your point is very valid.  I lack patience, and it is a problem, particularly in an electronics-related respect.  In this case, I let the board sit overnight after a brief second w…

I admire you getting in elbows deep into fixing your Macs, but you just seem to be jumping the gun a little too early and doing all the things I'd consider a "last resort" first an…

The dishwasher seems to have killed my board. SadMike.

Actually preemptive follow-up: I don't understand Apple's manual advice - how can you boot without extensions with no disk-icon [i.e. without an actual boot process] - same with th…

I've gotten the pointer to pop up.  Neither trackpad will move the pointer, but an ADB mouse will [ADB port - check], and the trackpads will move the pointer with the ADB mouse plu…

And this is VGA output. Unsurprisingly, the HD thing did not work.

If the 5300c has the same basic boot sequence (which I'm using to mean everything up to and including booting) then this seems to not be the case.  I'm going to install anyway and …

Well the thrust of that link has to do with some obscure [or he's wrong because this make little sense to me] issue with a dead HD preventing any booting and the flashing disk.  Th…

Link you've posted to refers to resetting the SMC (system management controller), which is analogous with Intel Macs - kind of like resetting the PRAM/CUDA on pre-Intel Macs.  Not …

I know this is a totally different ROM, and I know nothing about Macbooks so I don't even know if this info is correct, but there's no way, right... ?  https://www.ifixit.com/Answe…

Also the HD spins before the screen powers on.  I get no impression the floppy module does anything - but that may just mean it's not getting to a disk check - which should probabl…

With or without the PRAM battery, actually, it chimes infrequently and only through the speaker panel; but it comes on most of the time - not always.  It's worth noting that my 530…

Thanks for the response.  I didn't fire it up right away but I didn't let it thoroughly dry per se (I really went at it with the hairdryer - very thoroughly - including opening tha…

raoulduke said: I promptly disassembled it, removed the PRAM battery (which was not dead).  There was a little bit of very confined corrosion but in general the board is in f…

That was a slightly inaccurate description.  It would chime, and I could soft reset, but it would shut down within 5 seconds of chime.  The first time it might have actually restar…

I got the second PB 3400c today.  The battery was still in (both, actually).  When plugged in, it'd make the popping (probably speaker) sound and sometimes the screen's charging-li…

I should have put a question mark on superseding. It's a proposal-topic. It just seems like there's next to nothing on 3400 repairs.