on the side there is a bump push it up and it turns on
no you can't play dsi games in ds but you can play ds games in dsi.
you can play game boy games a normal DS but not on a DS light or a DS I.
Yes. The 3DS can play DS games and DS Download Play with them.
Yes you can play Nintendo DS games on a Nintendo ds lite.
You cannot store or play videos on a DS.
yes, it can
Normally, you can play new DS games on old DS. But if the games says for DSi only, or for 3DS(will be pubulished soon) only,the it can not play on old DS.
you can play Nintendo DS games on a Nintendo DSi (i suppose this was what you meant with DS you)
There is no such thing as a DS Lite game they are all just DS games. So, yes, you can play them on the old DS.
You can play any GBA (GameBoy Advance) on a DS and a DS lite not a dsi
Yes, the NDSi and NDS can connect to play DS games
Yes, the NDS lite can play all DS games