My stilo (1.6v Active Sport) battery died due to not being driven for awhile. I took the battery out charged it and put it back in everything is working perfectly except the head unit which now refuses to turn on. I checked the fuse which was f39 and that doesnt seem to be blown and its also tied to the ceiling lights which are working anyway.

Any ideas what could be causing this?

if memory serves there is also a fuse on the back of the unit, it maybe worth checking that one and the connections whilst it is out.
roy

edit, just checked there is a red 10amp fuse on the back of my spare mp3 headunit, so it could well be that

Thanks for the reply, i actually checked behind there and for some unknown reason as cable had become slightly loose. So all is fixed.