bmx2019

in iMac all is soldered. You need to get a new motherboard -totally.

If you look at the disassembly here… then you will know it is harmless. Motorola Moto G4 Plus Battery Replacement

too long means what? 1 min or 2 min? BTW do you have too many apps installed. Go to Finder->Applications Remove unwanted. YES. Move to trash. A lot of programs these days use background services to Monitor and WASTE computer resources. All this will need to somehow written to RAM or DISK depending on sleep mode. Or do a fresh install. Go to Activity Monitor and see what is using much RAM/CPU. Launch Pad -> Activity Monitor Insatll this and clean (open source program) https://www.bleachbit.org/

May be try to closely look with a ‘lens’ or microscope for any short/damage to the DC in board. Or replace it. Careful: may be you can cause more damage by opening and analysing. At least it works now!!! MacBook Pro 13" Retina Display Early 2015 MagSafe DC-In Board Replacement

This is not truly easy thing to solve: First get yourself a better battery. May cause more issues than just sparks. next get a logic board: MacBook Pro 15" Retina Display Mid 2014 Logic Board Replacement or the hard way: possible to replace capacitors but you need lots of tools you can look for youtube videos of rossmann + macbook repair if you are in the US try sending to them: http://www.rossmanngroup.com/boards I am not paid by them or so.

You only have two options: (1) MacBook Pro 13" Unibody (Mid 2012) 2.5 GHz Logic Board (2) MacBook Pro 13" Unibody (Mid 2012) 2.9 GHz Logic Board

may be some button is stuck. Clean the keyboard arrows...

paste the photo in the website: https://www.reddit.com/r/AskElectronics/ you will get answer.

Probably messages app got updated. Try to uninstall updates in the Messaging app. Press and hold - uninstall updates.

This is a ARM device. Not easy. Read this: https://archlinuxarm.org/platforms/armv8...-chromebook-r13#installation