After a break from this project over the holidays I went ahead and snipped the (very tiny) plastic tabs/ridges off of the connector on the cable harness and got the new panel reinstalled back into the iBook once again.
Ta-da ... Worked like a charm. No fried motherboard or lack of video! Thank goodness.
After all that, I'm actually not that impressed with the new panel; it's no brighter than the original (which I somewhat expected) but it's also got a glossy finish which I'm not a fan of. But at least it's sharp, working, and vinegar-syndrome-free.
So if anyone is reading this far in the future and is able to recommend a *known, tested working* replacement panel that has a *matte* finish, I'd be curious to hear about it. Also always curious to hear if others have had similarly major problems with this panel/seller.
Thank you to wottle on TinkerDifferent and
@GRudolf94 for the advice on this one. Very glad to have this mess of a project behind me.
Good luck with it. Unfortunately I ordered one of these panels a couple of days ago So I'm hoping you sort it out before I attempt to change mine. Cheers
So I'm gonna attest that it is *absolutely mandatory* that you *check* the orientation of your iBook's cable/signals, using a multimeter/probe type thing, before attempting this replacement. On mine, the tabs had to be snipped off so that the connector could remain in its original orientation but still fit the replacement panel which had it flipped. But others have reported buying the SAME panel from the SAME seller and receiving a unit that worked with no mods required. Not sure why but please don't end up with a fried motherboard like I did!