Perform this procedure with the power on and the keyswitch in the Power-on position.
With the keyswitch in the Power-on position, press the Break key on your alphanumeric terminal's keyboard, or enter the Stop-a sequence on a Sun keyboard.
To enter the Stop-a sequence, press the Stop key and the a key simultaneously. The ok prompt is displayed.
(Optional) Select a diagnostic level.
Four different levels of diagnostic testing are available for OBDiag; see "How to Set the Diagnostic Level for POST and OBDiag".
(Optional) Select a diagnostic target.
You can choose to run OBDiag with or without external loopback tests by using the OpenBoot PROM variable diag-targets. For more information, see "OBDiag Configuration Variables".
Enter obdiag at the ok prompt:
ok obdiag
When the OBDiag menu appears, enter the appropriate command and test name/number at the command prompt.
For command usage and descriptions, see "OBDiag Commands".
For more information about OBDiag tests, see "About OpenBoot Diagnostics (OBDiag)".