EMac won't start and 3 beep sound and light flash

My eMac suddenly got problem these days.
Last night, eMac can boot and login. Suddenly, the monitor cant display property. Then, i enforced to power off. Later, trying restart it. eMac cannot start up and breeze 3 beep sound and flash power light.
I checked support forum. It claimed that "3 beep - no good banks". Actually, i dont understand what it is. What i can i do??

KY18,
Welcome to the Apple Discussions!
The three beeps mentioned in Power On Self-Test Beep Definition means that during the startup test of RAM, the Mac detected that there are DIMMs physically in one or both sockets, but that neither DIMM is functioning electrically.
It's unlikely but possible that one RAM DIMM may have suddenly failed catastropicaly, far more unlikey if you have two DIMMs installed. A more plausible scenario, considering your mention of display problems, would be if the eMac were plugged directly into a wall outlet, or into a low-cost surge protector whose MOV hardware had degraded and failed (the status LEDs on low-end surge protectors are essentially worthless). If there was a power surge while you were using the computer, that could have blown out the RAM (and potentially damaged other hardware as well). Surch brownouts or surges are usually evident in the effect on room lights, clocks, and other elctronic devices plugged into the power outlets.
As a longshot, you can try pulling the RAM DIMMs and then reseating them in the slots, making certain that the thumb clips holding the DIMMs have snapped fully into place after reseating them. Check the RAM installation instructions at eMac - Do-It-Yourself.

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