Old World ROM Macs such as your 5300 do this. If certain problems occur on startup, they use sounds and hex codes and whatnot to allow people to identify the problem.
If you could record the sound, and post it, perhaps someone could help. If anyone has a library of these sounds and their corresponding problems, if you could post, that'd be awesome...
My PB100 is giving me a certain sound on startup too, with the "dead Mac" icon and some hex...
You may be getting a message from deep within your Mac, or it could be a crossed wire or some other sort of interference. Could you take it somewhere else in the house and try it?
Cipher13
[This message has been edited by Cipher13 (edited 02-10-2001).]