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14 - PowerBook G4 (15-inch FW 800_1.5/1.33GHz) Troubleshooting
Hardware Symptom Charts
Blue screen appears (a spinning disc cursor may also be visible),
Prohibitory Sign appears,
Restart dialog box appears (Mac OS X 10.2 kernel panic window), or
Gray screen during startup
Prohibitory Sign
Kernel Panic dialog box
1. Make sure all external devices are disconnected and any PC card ejected. If kernel
panic goes away, troubleshoot the external device by reconnecting each device until
the panic occurs.
2. If there are two RAM cards installed in the expansion slots, remove the top card and
restart.
• If symptom repeats, replace bottom card with known-good RAM card.
• If symptom does not repeat, replace top RAM card with known-good RAM card and
restart.
For assistance in software troubleshooting, go to Knowledge Base article 106464: Mac
OS X: Troubleshooting a Startup Issue.