17" Studio Monitor Constant audible clicking & screen dimming

Hello, I have an older 17" studio display (Blue casing) & I have recently set up a dual monitor system with a Viewsonic primary screen. I have an older G4, plenty or RAM & memory with a Radeon graphics card. The monitors work fine, but now the apple display keeps clicking audibly & display seems to keep re- focusing constantly. Even when screen saver is on the apple display symptoms persist. Any suggestions as far as settings etc... Thanks Martin

Thanks for the advice. I found another solution, but will bookmark yours in the event of future trouble.
I connected a small PC monitor to my G4 using the VGA connector, and restarted it. It started up fine. But when I went to reset the refresh rate, every option but one was grayed out. Dead End.
Then I restarted the G4 in SAFE mode (holding down SHIFT key during startup). This time I was able to change the refresh rate to 72, and reduce the resolution. Then I unplugged the PC monitor and plugged in the 21 inch studio monitor. It WORKED! I restarted the G4, and it found the correct refresh rate for the monitor. Victory!
Thanks again for the advice!
Power Mac G4 (AGP Graphics)   Mac OS X (10.4.7)   Graphite Studio Monitor 21 inch

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    Thanks for the advice. I found another solution, but will bookmark yours in the event of future trouble.
    I connected a small PC monitor to my G4 using the VGA connector, and restarted it. It started up fine. But when I went to reset the refresh rate, every option but one was grayed out. Dead End.
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