IBM RT PC Problem Determination Manual page 38

Problem Determination Guide
2-10
Before the diagnostics are loaded:
1. Check that the system and display power cables are plugged in.
2. Check that the keylock is unlocked.
3. Check that the display Brightness Control is turned up enough
to see the screen. See Appendix A for locations.
DID THE ABOVE CHECKS FIND THE PROBLEM?
YES STOP, you have completed these procedures.
NO CONTINUE to next page.
AIZAF002