Given none of the speakers are working, it may be that part of the big quad-lock plug on the back of the head unit has become disconnected - it's made up of a number of connectors, which all plug in as a single assembly (you'll understand when you see it). You'll need the radio removal keys (ebay, or probably can be ordered from Halfords) to have a look behind. Just make sure you put them inthe right way (check audio manual), and remove the keys before you put the head unit back in.
If the stereo powers up then unlikely to be a fuse issue, Probably the connecter has come loose or worse case the amplifier in the stereo has blown. As said above take the stereo out and check the connecters, its alot easier to do than you think if you have the correct removal tools.
your head unit is duff & nobody can get the parts to repair it.ours went the same way & the good thing is that the new focus(same head unit)has been face lifted & nowuses a different radio so ford have a very lot surplus.i went on ebay & a ford dealers in norwhich were selling them new for £50 & said they had 200 in stock i am sure they will still have some left good luck. also go to a mercedes dealers for your keys ask for 2 sets of sprinter up to 2006 model they are only £4.00 & are the same
If the head unit has blown up (but you'll have to take the HU out to replace it, so it's blindingly obvious to check the connectors on the back), then there are plenty of CD6000 floating about. However, some are from the old-shape Mondeo which have a slightly different surround (so the head unit isn't quite a rectangular shape) - these won't fit but one from the post-facelift old Fiesta and pre-facelift Mk2 Focus should work.
Alternatively, if you're on a tracker mortgage and feeling flush, then there are also 1 or 2 upgraded Sony units on ebay. But you might be better off spending on the Pioneer FH-P80 BT which has bluetooth & ipod compatibility, and is a double-DIN size.