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Was in my system prefs last night and accidentally selected "Network" as my start up disk.

This morning I turned my G5 on only to see a picture of the earth in a small box on my screen. I immediately realized my mistake. Tried to restart off Tech Tool Pro CD holding down the C key. I figured I could reset my startup disk if I could just boot off the CD. Still, a picture of the earth signifying a search for a network startup disk.

How do I get my Mac back to starting off the main boot drive?

boot while holding down the option key - it will drop you into the boot loader. Choose your internal startup drive and click arrow to continue booting. When you're in set the internal drive as the startup drive in System Preferences.

HTH