Here's what Digi tech support told me about this problem. Keep in mind, I have corrected it in the past by re-seating my 001 card in slot one and changing back and forth extension groups. At this point I think my card is bad because my system profiler and Digi test do not see it.
Here's Digi:
-I'm not sure if this is applicable but this error can occur if you
have previously installed Pro Tools FREE. Open the System Folder>DAE
Folder, highlight DAE, Choose File>Get Info and check the version. If
the version reads "Free," you will need to reinstall DAE:
-Trash the DAE folder that is currently installed (i.e. the Free
version)
-Copy DAE folder from the PT LE CD-ROM (you'll need to scroll down in
the window to see it) into the System Folder.
-Copy the two D-Verb plug-ins (D-Verb and D-Verb A/S) from the Plug-In
Updaters>DAE Folder>Plug-Ins folder on the CD-ROM into the System
Folder>DAE Folder>Plug-Ins folder on your hard
drive.<color><param>3333,3333,3333</param>
</color>-Open the Extensions Manager Control Panel. From the selected
set pop-up menu, select "OS 9.x base" click on "Duplicate Set" at the
bottom of the window. Name the set whatever you like. Enable the
following extensions and restart the computer:
-Digidesign Control Panel
-DigiSystem INIT
-Digidesign Direct I/O (required with DSI 5.0.1 and later)
-Digidesign DSP Manager
-Digidesign Stream Manager (only if using DirectConnect)
-Open Music System
-Trash the DigiSetup File, Pro Tools preference, and DAE prefs (the
entire folder) from the System Folder>Preferences folder. Empty the
Trash and restart the Mac. When you go back into Pro Tools, do so from
the Pro Tools Application Icon and not by double clicking on a
session.
-If you have changed the Minimum memory settings to Pro Tools or DAE,
you will need to set these back to their default values. Click on the
icon once to highlight it and select Get Info from the file menu in the
Finder or by holding down the command key and typing the letter I.
Highlight each field, type a 0 and press Enter on the numerical
keypad.
-Reduce the Disk Cache in the Memory Control Panel to 512k and restart
the computer.
-You may be experiencing intermittent hardware failure. Run DigiTest on
the card and see what it reports.
Best regards,
Digidesign Technical Support