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Reminds me of the old word processors from Brother. That’s one nice machine!

If anyone wants the lower assembly, its up for sale in the trading post. 

I was so worried I had spent money for nothing. Had that happen with some ram that turned out to be faulty. eBay returns are not always amazing.

It’s ALIVE Both the ram and cpu are working just great with the new brick. And I can now confirm it was the old one. Guess it’s time to make a new one with the cable. Since I now have some extra parts, along with an entire lower assembly, I’ll test the parts and sell them here someone else can...

If I could, I would just get blank plates and make that. I’m no master when it comes to building electronics from scratch so I’ll have to take real good care of that power supply until I can understand how the power supply works.

My power supply is on its way. From seeing the pictures and retesting my own, which gets no current on any hole, make me really hope and think it was that power supply. I wonder if there is a guide to make a modern replacement using the head for the plug, since its uncommon.... Guess I’ll...

I just purchased a power supply from a seller on eBay. Very much hope that this is the reason my PowerBook will not turn on. Should be coming later this month. :/

Yep I’ll do that tonight. Off to buy a new one! Thanks everyone. I’ll update this when I get a new and see if that does it.

It does not read anything on the rails. I think it’s shot. Thanks for the listing I put an offer in for it. Looks like I will most likely need a new one. 

Just tried your solution and it still won’t spin up or chime. Starting to thing it’s that power supply. I may get a replacement to try but what would I get?  

Where would a reset button be? 

Ok! I’ve checked the cpu, tried it without ram and tried a spare with no luck. No chime, no boot. I have plugged in speakers in the audio jack and tried an and keyboard to power it on, no dice.    I have not checked the dc power as I don’t know the pin out. I have a multimeter but can anyone...

I’ll start check off from this list ASAP. Would you have any idea where I would find the pinout? Last time I looked, albeit briefly, I came up short.

I recently just got a new cpu and ram for my PowerBook 520c and went to try the new processor and it wouldn’t even spin up. Switching the cpus back does nothing either. It relies on it’s old ac adapter and I don’t know where to start to get it working. Any ideas to start? :( Emmy

Thanks. Always good to have an extra brain to spitball an idea with. Thankfully with the holidays, I have nothing but time right now so I may pull the trigger if I can’t get ahold of a 16 mb card.

https://www.ebay.com/itm/Macintosh-Powerbook-500-Series-BCGM44-Bottom-Half-With-8GB-Memory-and-66-33-MGZ/313124900139   picture 4/10 gives a good picture and yes, they are blank pads. 

Hi everyone!  I got my hands on a PowerBook 520c a little while back and was wondering with the ram card kind of expensive and hard to find on eBay, could I get 2 8mb ones (identical cards of course) and combine them on one board to make a 16mb card? If so, would it be practical? Any answers...

Yes! I was a little confused but this is what I needed. 

Hey everyone! Got a quick question to ask, I'd like to replace my 1/2 size AA battery with a cr2032 or AA setup. How would I go about doing either? Is it a simple solder? Thanks :)

6s owner here! They are still great phones and are fun to go down the “cough cough jailbreak cough cough” way. I still love the fact that it has the 3.5mm headphone jack. Don’t see that anymore. :(