HP XM600 - Kayak - 128 MB RAM Technical Reference Manual page 138

6 Tests and Error Messages
Error Message Summary
Message
Other
138
Explanation or Suggestions for Corrective Action
An error message may be displayed and the computer may "hang"
for 20 seconds and then beep. The POST is probably checking for a
mass storage device which it cannot find and the computer is in
Time-out Mode. After Time-out, run Setup to check the
configuration.