iMac G5's screen is completely black, but it seems like it works perfectly.

See if your model G5 iMac qualifies for the iMac G5 Repair Extension Program for Video and Power Issues

**WARNING: DUE TO SECURITY REASONS, PLEASE DO NOT POST YOUR COMPUTER'S SERIAL NUMBER ON THESE MESSAGE BOARDS.**

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If your computer does not qualify, then you will need to supply details about your system.
Which "model" & "generation" G5 iMac do you have?
Need this info so that the knowledgeable users can provide you with the proper troubleshooting solution(s).
http://docs.info.apple.com/article.html?artnum=301724-en How to identify your iMac
http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh355.html Getting information about your computer

You can have this info displayed on the bottom of every post by going to 'My Settings' which is located in the column on the right under your name, and filling in the information asked for.

Thank you

Except for the keyboard & mouse, disconnect all devices from your computer & check out the following:

http://docs.info.apple.com/article.html?artnum=301283 Troubleshooting when there's no picture on the display

Mac OS X 10.4 Help-My Dispay Doesn’t Look Right

The M# is not a serial number.

*+Where do I find the serial number of my iMac G5?+*
+The 11-digit serial number is located on a label under the foot of the iMac G5. There is a bar code underneath the serial number. To view the label, hold the sides of the iMac and gently lay the computer face down on a soft, clean towel or cloth.+

Also, did you try the solutions in the links I posted in my original response?

Do not post your serial number. Look at the serial numbers on the links that were posted above and see if your serial number is in those ranges. If so then your computer qualifies for the special services provided in those links.

"but I thought it I was not suppose to give out my serial number."

Your not! However, you did not mention in your response if your +serial number+ qualified? You mentioned/provided your marketing model #.

If no one else chimes in here w/solutions, you may need to take your comp to your nearest AASP.

Only the repair shop can answer that one for you. They need to make a diagnoses. You should ask for an estimate when/if you take your comp to an AASP or Apple Store for repairs. This will give you an idea of the cost. You will also have to take into consideration taxes & labor costs.

If your computer needs parts that are not available and/or it will take some time for the repairs to be done, then request a loaner.

Good luck!

Alexcb, why not ask them yourself? This way you will know for sure.

Personally, I don't see why not. However, each service center has their own rules.

You can always ask for a loaner.

You're welcome & best of luck to ya!

Please post back w/the outcome.