How to access previous support articles?
If you are lost on the Apple support globe and its new appearance and older forum links are leading to nowhere, the wayback machine may be helpful:

About the Power Mac G5 (Late 2005) diagnostic LEDs

This support article doesn't mention beeps but only flashes and colors.

BTW the Apple support site still features searches:



The result is not very helpful though, despite the fact that the article is still available in the archive. I haven't been able to find it in the 100 listed results.