Hi woodto,
First things first
Ok, in order to reset the box all you normally need to do is unplug it, leave it a while (30 seconds should do) and then plug it back in.
You will need to leave it a couple of minutes after you have plugged it back in so that it can sort itself out.
I'm sure that should do the trick (with regards to resetting) but not sure that will solve your picture prob's.
Wait a bit and see if anybody else has any other ideas (or agrees / disagrees with me
).
Hope you enjoy your stay here at CF