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Both of the laptops that you purchased are pretty high end and you likely have an empty memory module slot on both. If this is the case I would recommend buying a matching memory module to double the memory. If it doesn't have an SSD or the drive is cheap (slow read write times) you can gain a...
The IMEI is assigned to the hardware, not the microSD. If you have a receipt from the date of purchase that should be sufficient to get warranty repairs done since it should contain the IMEI of the device that you purchased. If the vendor is shady, then maybe not. Batteries aren't too hard to...
If it is an iPhone you can change the desired output but there isn't a way to keep it from connecting to a known device unless you remove the pairing by selecting "Forget this device". i.e. You are listening to music and then get in your car. It will always attempt to switch to the car...
By coax, do you mean RCA ? If the connection is full of dust on an RCA connection it can crackle. Turn it off and use some electronics cleaner in the port. Make sure it is dry before plugging back in and turning it on. If your player and TV support Optical audio you can buy a cable pretty...
To change region settings on a Samsung you need to reset the Smart Hub: Settings > Support > Self Diagnostics > Reset Smart Hub. If you restart the TV it should begin setup again. If not, Settings > General > Start Setup. (The option will not be available if you are running apps)...