I sounds like you have a bad cable(s) going to the screen.

Replace the AV cables.

These fans cannot be repaired and is most likely the bearings are failing. The fan will need to be replaced. You can either find an OEM fan or a compatible aftermarket fan and splice it in.

I would start by replacing the batteries. Is is very likely that the dead batteries are trying to draw the majority of the power thus not leaving enough power to run the pump.

In your engine, there is more than one thing that could be affected in a seized engine. In all my years, spraying penetrating spray on the pistons is futile at best. You need to understand that when the engine loses oil, the pistons somewhat “weld” to the cylinders, the bearing in the connecting rods in some cases can “weld” to the crank shaft and many other parts. I have seen enough seized engines to know that you won’t likely break the pistons loose and even if you do the damage is done and the engine needs to be replaced or rebuilt.

Clean the contacts with either a red rubber pencil eraser ( the abrasive kind) or a small stainless steel brush (very gently scrub the cartridge contacts as to not damage the cartridge) and afterwards take a cotton swab dipped in rubbing alcohol and go over the contacts once again. If this doesn't work, you have a faulty cartridge.

Should be under warranty. Take it to the dealership.

You need to first try to clean the contacts on the cartridge it's self. I suggest getting a small stainless steel brush and gently scrub the contacts up and down. If you don't or can't get the brush, take a red rubber pencil eraser and use it to scrub the contacts. after you have cleaned the contacts, get a cotton swab and isoprophyl alcohol (preferably 80% or higher concentration) and go over the cartridge contacts for the final cleaning. If this fails, the cartridge has gone bad. Update (02/02/2021): Never use nail polish remover on a game cartridge. There is a good chance of melting the plastic and ruining the cartridge.

If the books are from Amazon and Nook, you should only need to download the apps and enter your user name and password to have access to your books.

At one ohm, the amp will most likely see it as a short and either lock down the amp or blow the amp. Don't do it.