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Contents iv
3.4.3 POST Progress and Error Reporting 3-18
3.5 Bypassing POST 3-21
3.6 Additional Keyboard Control Commands 3-22
3.7 System and Keyboard LEDs 3-22
3.8 Initializing Motherboard POST 3-23
4. Troubleshooting Procedures 4-1
4.1 Power-On Failure 4-2
4.2 Video Output Failure 4-3
4.3 Disk Drive or CD-ROM Drive Failure 4-3
4.4 Power Supply Test 4-5
4.5 DIMM Failure 4-7
4.6 OpenBoot PROM On-Board Diagnostics 4-8
4.6.1 watch-clock 4-9
4.6.2 watch-net and watch-net-all 4-9
4.6.3 probe-scsi and probe-scsi-all 4-10
4.6.4 test alias name, device path, -all 4-11
4.6.5 UPA Graphics Card 4-12
4.7 OpenBoot Diagnostics 4-13
4.7.1 PCI/Cheerio 4-15
4.7.2 EBus DMA/TCR Registers 4-16
4.7.3 Ethernet 4-16
4.7.4 Keyboard 4-17
4.7.5 Mouse 4-18
4.7.6 Floppy 4-18
4.7.7 Parallel Port 4-18
4.7.8 Serial Port A 4-19
4.7.9 Serial Port B 4-21