I killed my iMac, help please!


i replaced battery in imac g3 , took out old memory card , put in 2 new memory cards, following instructions got off internet. when turned on, beeped @ me , power light flashing yellow , green. help! how save it?

edited add: put old 1 in along 1 new one. made "dong" startup noise, screen black.

edtied again: took both new cards out, , it's happy again , os 9.1. wanted more memory upgrade os x. went wrong?
 

mmmm not sure if can help... googled beep codes computer , said there no ram installed or detected. sure ram compatible?
 


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