hi there
the 1st two pics are of under gravel filter(ugf)
a piece of pipe is missing , the bubbles rising up tube create a flow of water tunder the gravel , this alows the growth of benificial bacteria.
the thing with red arrow is power filter and should make a wurring noise when plugged in, sounds like that one is stuffed,
the other two items look like canister filters
hope that helps
cheers Simon