IBM RT PC Problem Determination Manual page 74

Step 72. Diskette
2-46 Problem Determination Guide
It is possible that the diagnostic programs could not load from the
diskette drive. If the program was unable to load from the diskette,
the system may have loaded from the fixed disk.
IS THE SCREEN ON YOUR DISPLAY YOUR USUAL
OPERATING SYSTEM SIGN-ON SCREEN?
YES CONTINUE to next page.
NO Go to "Step 100. Display Types" on page 2-52.