IBM RS/6000 7025 F50 Series, Service Manual, Page: 46 / 362

Step 1520-5
One of the parts that was removed or unplugged is causing the problem. Install or
connect the parts in the following order.
1. CPU card(s).
2. Memory cards. (One at a time)
3. SCSI devices, lowest bay to highest bay.
4. PCI cards, lowest slot to highest slot.
5. ISA cards, lowest slot to highest slot.
6. Fans.
Turn the power on after each part is installed or connected. If the system does not
power on or the power LED does not stay on, the most recently installed or
connected part is causing the failure.
1. Turn the power off.
2. Unplug the system unit power cable from the wall outlet.
3. Install or connect one of the parts in the list.
4. Connect the system unit power cable to the wall outlet.
5. Turn the power on.
Does the fan in the power supply turn on and the power LED come on and stay
on?
NO Replace the last part installed.
If the memory card was just installed, remove all of the memory DIMMs. If
the system does not come up, replace the memory card.
Re-install the memory DIMMs, one pair at a time, until the problem recurs.
Replace the memory DIMM pair that was just installed.
Note: The memory DIMM pair must be installed in slots that are next to
each other. For example, install the pair in J1 and J2, not J1 and J3.
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
2-13 in this MAP and follow the instructions for the new symptom.
YES Go to "MAP 410: Repair Checkout" in the IBM RS/6000 Diagnostic
Information for Multiple Bus Systems.
2-16
Service Guide