Q: My iMac G5 display capacitors

You'd probably have better luck replacing the logicboard.

http://www.ifixit.com/ may know where to get it.

In the U.S. I think http://www.dttservice.com/ may also be able to help you.

jimwarholic.com  Just checked site.  let me put capacitors in my cart.

Google: g5 capacitor replacement kit

More info on capacitor replacement kits

http://jimwarholic.com/2008/07/how-to-repair-apple-imac-g5.php

http://thecapking.com/applg5.html

A success story:

https://discussions.apple.com/message/22751906#22751906

G5 has these hardware issues:

  -- bad capacitors on logic board

  -- bad capacitors in power supply

  -- badly soldered video chip

  -- "There were several Mac models with flat panel displays that had bad displays.

      Most had serial numbers beginning with "W8"---the code for one specific factory.

      This affected PowerBooks as well. If that's the case, the rest of the computer

      is probably fine." by Allan Jones in

     https://discussions.apple.com/message/21630224#21630224