Turn computer on, goes to green, flashes yellow, back to green and no scree

So I turn the computer on, the power button goes to green, flashes yellow, back to green and all the while the screen is not turning on. This just happened all of a sudden after no unusual circumstances. Help please! I've been looking for similar topics without much luck. And I'm not very computer savvy so I'm afraid to try replacing the PVM or whatever it's called. iMac G3 with I believe Mac OS 10.2
Thanks,
Nate

Hey Natopo,
How many beeps?
Depending on which iMac you have?
This is from:
rccharles about a 266 tray,
Posted: Nov 28, 2007 8:30 PM in response to: scottmd06
"Following is a definition of what the error beeps at startup time signify.
One Beep: No RAM is installed or detected.
Two Beeps: EDO memory is installed. (The iMac ships with SDRAM SO-DIMMs and does not accept EDO memory).
Three Beeps: No RAM banks passed memory testing.
Four or Five Beeps: Bad checksum for the remainder of the boot ROM. The ROM (which is located on the processor module) is bad."
Richard

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Turn computer on, goes to green, flashes yellow, back to green and no scree

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