This is a brief explanation of what happened with my monitor for all of you who were so kind to respond, offer great advice, good suggestions & excellent links to information regarding this problem.
After 'living' with it for a couple of weeks I finally decided to take it to our local Apple certified repair center and have their technician open it, check the florescent tubes and replace the ones that were 'out'. Time spent there got quite lengthy and I won't go into the details but, after he finally found a G5 [originally said he didn't have a machine to hook it up to...
], when it was attached and booted, the light was no longer flashing and the whole screen was back to normal/evenly lit!!!
I'm sure I stood there with my mouth open and still have no clue why a bumpy car trip to the 'doctor' would 'fix' it but it did--amazing!!!. I brought it back home, crossing my fingers all the way--not really... but hoping it would remain in its 'fixed state' after hooking it back up.
It did and has and I'm delighted, to say the least, and want to thank you all for your support. Your'e the best!!
Laurel