Apple M8760LL Service Guide - Page 132

Blue screen appears (a spinning disc cursor may also be visible), Prohibitory Sign appears, Resta...

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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. 14 - PowerBook G4 (15-inch FW800) Troubleshooting Hardware Symptom Charts

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14 -
PowerBook G4 (15-inch FW800) 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.