A:AnswerAny pair of speakers as long as they are made to use with a computer and has a compatable plug to plug into the computer will work. Usually the higher priced speakers work better than the real cheap ones.
A:AnswerWith a 1 TB hard drive, you can store thousands of photos.
As for writing letters, I recommend buying Office 365 so you have an entire suite of word processing and other capability.
A:AnswerNo adapter required. It can be connected two ways:
Regular VGA-VGA cable depending on the age of the monitor, or
HDMI to DVI cable. This gives a cleaner picture.
I used both options and they both work.
A:AnswerYes, your mouse and keyboard should work just fine. I bought a wireless mouse and keyboard for this computer and was able to set them up and use very easy.
A:AnswerIf the computer is not fully shut down, the light may stay on. It could be in sleep mode. It could also just be an indicator that the computer is getting power from being plugged in.
I hope this helps.