Help Im stuck in 256 color mode

I can't seem to get my computer back on infinite color mode. I have changed my preferences and have 1490x900, Millions checked. But the color appears to be stuck in an old 256 color mode. I also have a monitor icon that appears in the upper right hand side of the screen but that was never there before.
I'm running OS10.4.8... on my iMacG5
iMacG5 iBookG4 Mac OS X (10.4.8)

Open the Universal Access pane of System Preferences and check the settings in the Seeing tab; these settings can affect the colors displayed on the monitor.
(19484)

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Help Im stuck in 256 color mode

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