It sounds like something on the board is shorting, if you could see if any metal that may make contact with the on the motherboard try to cover it with electricians tape and see if that fixes it

Well it probably is the motherboard. Because of the sensitive nature of a data recovery, unless you have very specialized tools and know how, would probably be better to take it to a shop that specializes in that sort of thing, sorry to tell you.

That is an adhesive strip that you should use to reapply adhesive after replacing the screen Instructions here

You cannot remove the glass from the LCD without damaging the LCD On top of that you do not want to remove the glass infront of the LCD for that is the touchscreen and if you were to remove it you would basically lose all function of the phone [Edit] Taking into account the answer from @dadibrokeit I think that if you really want to then you can, I have no idea how much technical experience you have but if Mr. Wheeler, who has decades of experience in phone repair, was unable to do it. Than I don't know how well even I could fix it. Again if you think you can than kudos to you and good luck fixing it.

Those types of machines do not take SIM cards and instead you have to have a WWAN card aswell installed, which your laptop does not so cellular will not work on it

What is happening is that the laptop is overheating IF YOU KNOW HOW (this is a rather difficult procedure) open the pc, clean the fans, check the copper tubing running from the fans if there are any holes or tears or anything. if there are tears replace the fan assembly Now the hard part, take the fans off and replace the thermal paste If it doesnt fix it I have a few other ideas and please tell You can use water and air to clean the fans but only if you take the fans out, if you dont feel comfortable taking out the fans use alcohol prep pads (you can find them at cvs or any pharmacy)

Ok bad news, based off the fact that you put in in upside down could mean that you bent the pins inside the connector, if you could, take a microscope or anything like it and look at the pins of the connector, if anything is bent you can try to bend it back with a very fine pair of tweezers but be careful to bend it back correctly or break it off.

First of all get that SIM tray out of your mutt's stomach. Its metal, pointy, and one heck of a thing to pass naturally Secondly you need to find a SIM card tray replacement, the size of the SIM card in your specific model is nano there is something like it here however if you go to your mobile service provider they may be able to provide you with a sim card tray

Its a thicker piece of paper that is stronger than normal paper but not quite cardboard, its the same stuff that buisness cards, playing cards, etc. are made out of hence "cardstock" Construction paper is very similar in use and usability, you can probably get it at your local arts and crafts store, if not here is a 300 piece 8.5 by 11 inch box on amazon

Eventually samsung stops letting phones update to "encourage" people to get the newest phone. Considering the phone came out in 2014 I would assume that it passed that date That means that the phone is not able to recive updates and you can't update it