novation zero sl

[musicdanz]

hi iv been using pro tools for some time now but the last couple of days iv had some problems,
a few weeks ago i got a novation zero sl mrk 2 which has been working grate!
but then boom its gone.
iv completely reinstalled pro tools 8.0.1 but still no joy its not in the midi devises i have a m audio ozone which is listed ,i also went in to the perferols menu to actvate the hui but its not there ,it will trigger plugins via the auto map so i can do filter sweeps ect but cant hit play on the novation and play the session like it did do .iv checked everywere but the zero is just not listed anyware like it was .iv tryed looking online for some reason for this and have found nothing .iv tryed deleting pref"s but still nothing iv been into the auto map software and dun the walk throw of how to set it all up but when it come to setting up hui its just not listed.
IM A END AND NEED SOME REAL HELP...