videoplayer/recorder?

have an old Aiwa video player that works, in that the tape is going round but it doesn't appear on our tv screen. we have a sky box and it used to work fine through that but now doesn't. I wanted to reset it on a channel but don't know how to do it. (the guys who put the sky box in did it for us). Any help would be appreciated. Otherwise, can you still buy video players?Kate