powerbook 100 issues
So recently i found a powerbook 100 in my grandfather's old things. When trying to power up the computer, nothing happened. My first instinct was the bios batteries, because after 25 years they are sure to be ancient. Replaced those, and now when those are the only source of power the screen flickers a little. Plug in the charger or the actual battery, and it goes back to being a brick. I'm really at a loss here! This isn't my first repair, but i rarely work on apple laptops (i repair computers as a hobby so it's mostly old pc desktops). Am i missing something obvious?
Thanks in advance for any and all help!
PowerBook, Mac OS 8.6 or Earlier