Option Key won't work at Startup

I understand that holding the Option Key at Startup will give a window to select start up drives. Apparently, on my G4, that doesn't work (I have an Apple Extended Keyboard)
Is there an alternative way to access my startup disks when I power on? Preferably not in Single User mode?
PPC G4 Dual 450 upgraded to Dual 1.3 Mac OS X (10.4.8) 9200 Radion, Controller Card to hold Hard Drives, and a Networked G3 Desktop

Restart the computer and after the chime press and
hold down the OPTION key until the boot manager
screen appears. If this isn't working then you may
have a problem with your keyboard, OS X, or need a
firmware update:
http://docs.info.apple.com/article.html?artnum=86117.
The keyboard is fine, I use the Option key all the time during normal use. Other Start up commands (command+option P+R) My Firmware should be up to date (had to update it to install the new Processor) Currently, OSX 10.4.8 has been somewhat questionable (I've posted elsewhere about my prefered Start Up not working).
I found a link saying that some G4's might not have the "Option" to Boot Manager. If that's the case with my Gigabit Ethernet G4, could there be another way to access the Boot Manager at Start up?

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Option Key won't work at Startup

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