There is a great TroubleShooting guide already installed on Mac.
From Finder, simply press the Help key on the keyboard (or press Command+?):
Also, there's an entire library of support and User Forums at Apple(support).com.
In troubleshooting (OS 9):
If you know what happens when booted with:
The rest is ELEMENTARY (once you have done it a few times)....
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Note: G. BALLARD prefers a shredding if he is wrong or unclear.