Help me? PLEASE!!! my screen has gone loopy!!!!!!

hi ,
i was trying to adjust my appearance settings , and my monitor went blank, the green light on my monitor keeps flashing but nothing appears on my screen.. i have rebooted the computer but the same thing happens..
can anyone advise on what my options are!!!!
if i change my monitor, will it automatically retune and work or am i doomed....
thanks in advance
g4 450 Mac OS X (10.3.9)

Hi-
Welcome to discussions!
I am assuming that you are refering to an Apple CRT display (not LCD).
Take a look at the following document, and follow the trouble shooting proceedure:
http://docs.info.apple.com/article.html?artnum=30280
Try resetting your PRAM. When starting up, hold down the cmdoption+pr keys, and continue holding until the second start up chime:
http://docs.info.apple.com/article.html?artnum=2238
Often over looked and neglected, the little 3.7 volt battery could need replacing:
http://www.info.apple.com/usen/cip/html/g4ge/g4gbenet-battery-cip.mov.html
G4 AGP(450)Sawtooth Mac OS X (10.4.8) 2ghzPPC,1.62gbSDRAM, ATI9800, DVR-109,(IntHD)120&160,LaCie160,23"Cinema Display

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Help me? PLEASE!!! my screen has gone loopy!!!!!!

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