IBM 7012 300 Series Installation And Service Manual page 52

YES
Step 9
(from Step 8)
1. Set the power switch on the system unit to Off.
2. Connect the signal and power connectors for the disk drives one at a time. Start with the
connectors for the drive that contains the bootable operating system software.
3. Remove any diskette from the diskette drive.
4. Set the power switch on the system unit to On.
5. Wait for one of the following conditions to occur:
The three-digit display is blank.
The system stops and c31 is displayed in the three-digit display.
The system stops for at least three minutes and a constant number, character, or
symbol is displayed in the three-digit display and the power light is on.
The system stops and two or more numbers with values between 221 and 296 are
displayed alternately in the three-digit display.
The system stops and a flashing 888 is displayed in the three-digit display.
The power light does not come on, or the power light comes on but does not stay on.
Is c31 displayed in the three-digit display or is the three-digit display blank?
NO
2-1540-10
Installation and Service Guide
For Models 340, 34H, 350, 355, 360/36T, 365, 370/37T, 375, 380, 390,
39H, and 397:
1. SCSI bus extender card
Note: Refer to POWERstation and POWERserver Common
Diagnostics and Service Guide , Chapter One; SCSI-1 Adapter
Fuse Blowing and PTC Tripping.
2. SCSI cable
3. SCSI terminator
4. System planar
5. Power supply.
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, 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 1 in this MAP and
follow the instructions for the new symptom.
Go to Step 9.
The last SCSI device that you connected is defective.
Exchange the defective device.
Repeat this step until the signal and power connectors for all the disk drives
have been connected.