It seems like the most likely explanation would be that something is wrong with the new battery you installed. Given that the computer boots, even though it doesn't stay on long enough to get past the login screen, that's a good sign that you didn't break anything during the repair process. I would recommend if you have a multimeter, try probing the contact points of the battery and see if it registers any voltage (somewhere around 11.25 would be normal). If not, I would return the battery and describe your issue and see if iFixit can handle sending a replacement or give specific advice about their battery. It may also be that one of the cells that make up the battery has come disconnected, or there is an issue with the small bms board that is part of the battery.

Generally if you lost the password for your mac account, then you need to try and reset your password through iCloud. There is a helpful article on apple's website that I will link here for you: https://support.apple.com/guide/mac-help/reset-your-mac-login-password-mh35902/mac

That is generally the best course of action. Additionally, If the ports don't work after they are dry, you can also try to visually inspect the ports to make sure they do not look corroded, which could happen if they get wet. Otherwise, your computer should be good to go after letting it sit and dry for a while. (If you can't wait that long a hair dryer could speed up the process)

If you are knowledgeable and comfortable working on and cleaning the motherboard and parts I would recommend trying to clean it. since you showed it in your pictures, the fans can be cleaned by disassembling them and using 90% isopropyl alcohol to remove the smoothie residue. you could also soak the fan blades themselves to remove the residue. Since you shut it down right away and the smoothie was dried by the time you tried to power it back on, the electronics were probably not short-circuited so once cleaned they may still work. Best of luck on the repair!

I would recommend replacing the brake wire that is frayed, which if you know what you're doing can be a cheap and easy fix. Otherwise, I would recommend taking it to a local shop that knows how to repair walkers, or a normal bike shop as bike brakes operate using a similar mechanism and the employees should be able to help you.

The SSD change should not really affect the device's ability to connect to the dock. My thought would be that possibly during the replacement process some part of the dock connection circuitry was damaged, the fact that it still charges but doesn't connect to any devices means that maybe the data connection lines are damaged but the power lines are still intact. It may also just be a software issue that can be fixed with an update or a restart.

The issue may not be with the cables, it may be ports on either the Nintendo 64, or on your media receiver unit. You may want to check the connections to make sure they are clean and don't have any dust or corrosion on them. If there is no problem with the connections, it is probably just something wrong with the video output circuitry in the Nintendo. In that case if you do have the technical knowledge you may be able to open the device up and attempt to replace any faulty components.

I have no idea if this works, but with a little searching i found this forum post where someone seems to suggest a solution. https://forum.xda-developers.com/t/tcl-10-pro-demo-remove.4196923/#post-84809783 once again i have no idea wether or not this really works, but it seems worth a try

I have this same drone, but have never had that issue, if you have knowledge about repairing electronics and feel comfortable, i would try opening it up and checking the battery connection wires, that may have gotten unplugged somehow. If that doesnt work i would recommend either a battery replacement (i don't know if that is possible to do DIY for this controller) or i would send it back to DJI and see if they can repair it. A sudden loss of power may not be a battery related issue as batteries dont tend to do that if they are connected properly, so it may also be a problem with some other part of the controller or power distribution circuitry inside.

Well, first off, what they are most likely testing for is wether the ipad has been opened/tampered with or not, because if it has they will probably say that the charging issue is caused by tampering. I assume what they mean by a "paper" they mean a piece of magnetic sensitive viewing film, this is a film that is sensitive to magnetic fields and when placed over something it will show the outlines of magnetic parts. How this can be used to determine if the ipad has been opened? I don't really know. but most likely they have magnets positioned in ways that they can tell if the case was opened after it left the factory. I dont know why they wouldn't be able to do it til they had one in stock, but probably it is because they want to make sure they have one to send back to you as soon as possible. If you are interested, there are several cool videos on youtube that explain magnetic viewing films Sorry I am not an expert on any of this, just making educated guesses, but i hope this is helpful!