IBM RS/6000 7043 43P Series Service Manual page 56

Step 1240-4
One of the FRUs remaining in the system unit is defective.
1. Power off the system. Refer to "Powering Off the System".
2. Exchange the following FRUS in the order listed:
a. System Board
b. Power Supply
3. Power on the system. Refer to "Powering On the System".
Does the system stop with a memory checkpoint displayed on the operator
panel?
NO Go to "MAP 0410: Repair Checkout" in the Diagnostics Information for
Multiple Bus Systems.
YES Reinstall the original FRU.
Repeat this step until the defective FRU is identified or all the FRUs have
been exchanged.
If the symptom did not change and all the FRUs have been exchanged,
go to "MAP 1540: Minimum Configuration" on page 2-21.
2-14
7043 43P Series Service Guide