My iMac G5 (2005) 512 MB RAM doesen't work

Soon after starting up, my iMac G5 got stuck. Then I forced it to restart (pressing option command and power button) and it went to stop (or sleep, whatever the difference): completely black screen and flashing white light on the right under the screen.
When woke it up (pressing any key) the blue screen appeared, followed by strange blurred stripes.
I tryed several times to force restart or shut down (pressing power button), but it only went to stop and then the same horrible stripes.
I don't know what to do.
Please, help me.
Thanks.

You can get good RAM from [macsales.com] or [newegg.com] or [smalldog.com]. Make sure whatever you buy is guaranteed for life. You can add 2GB to your iSight, for a total of 2.5 GB and it will be well worth doing. Installing it is a snap, simply unscrew the 2 screws at the bottom of the case, remove the cover, slide the RAM in until you hear a click, it will take a hard push to get it all the way in (remember to ground yourself), replace the cover and you're all set.

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