shutter on vivitar dvr410 mini camcorder?

i have a vivitar dvr 410 mini camcorder, which has been
operating ok for some time but all of a sudden the
shutter seems to have shut and will not open.
both still picture and video modes and menus are
working normally, power and battery both ok, every
operation of every function of camcorder working
normally, except for the shutter failing to open.
just getting black screen but all on sreen menu icons
are visable and unaffected.