AFAIK only if you exported them. Then you are able to import them again.
Are the also not available in the GUI when logging in as admin?
Login as your administrative user. Go to the Admin tab and look under Management for the Orphaned Content. You may find the missing dashboards there.
You can also go to the Dashboards tab, and look under Actions for Manage Dashboards. Try and search there to see if they may be owned by a different user. If so, you may need to Clone those dashboards.
thanks for the replies but i ended up doing a full VM restore and all dashboards are visable again.