When the Mac chimes it means it has checked to see that needed subsystems are present. Does not mean they are working correctly simply that they are present.
The bong means a lot more than just "present".
It means that the CPU check has completed successfully. That the memory controller says the RAM is working. That the video circuitry (if built-in) and VRAM is working. And that the PCI and various peripheral bus controllers are working. If any of these items fail the self-tests, you get a chord instead of a bong.
And note that the more RAM you have, the longer it takes for the RAM check to run - so it takes longer to bong.
After that bong, the video circuitry is initialized - which usually turns on the monitor. Then the drive\partition pair pointed to by the PRAM is checked for a boot block...
- Dan.
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