IBM RT PC Options Installation page 240

9-16 Options Installation
44. Correct the problem, plug in all power cables to wall or other
electrical outlets, and retry the Options Installation Checkout
starting with Step 2.
45. Go to IBM RT PC Problem Determination Guide or to IBM RT
PC Hardware Maintenance and Service, and perform the problem
determination procedure.
46. Return Diagnostic Diskette 1 to the IBM RT PC Problem
Determination Guide; the options checkout is complete.