IBM RS/6000 7043 43P Series, Service Manual

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Does the fan in the power supply turn on and the power LED come on and stay
on?
NO Replace the last part you installed. (If this part was a network adapter,
see notes on 2-1.)
Repeat these steps until all the parts have been installed.
If the symptom did not change and all the parts have been replaced, call
your service support person for assistance.
If the symptom has changed, check for loose cards, cables, and obvious
problems. If you do not find a problem, return to “Step 1520-1” on page
2-16 in this MAP and follow the instructions for the new symptom.
YES Repeat these steps until all the parts have been installed.
Go to "Map 0410: Repair Checkout" in the Diagnostics Information for
Multiple Bus Systems.
2-20
7043 43P Series Service Guide