I had thought the opening boing indicated
something relating to the health of the Mac.

That's correct. It indicates the results of the Mac's Power On Self Test, the bong means she's all good. Probably Tiger's done something to your BIOS/ROM as that chime is an instruction in the ROM. It's a bit of a concern, what else has it altered?

Under Tiger you can now check the results of the Power On Self Tests (POSTs) using Apple System Profiler. Assuming of course that your machine gets far enough to run Apple System Profiler if it fails the POSTs :)

Have fun,
Shay
--
=========================== Shay  Telfer ================================
 Perth, Western Australia   Technomancer  The love of liberty is the love
 Opinions for hire              [POQ]     of others; the love of power is
 http://public.xdi.org/=Shay    fnord     the love of ourselves - Hazlitt