My Mac Pro doesn't chime every time at startup

I've heard this is not a good sign, but the kid on the phone at Apple says he can connect it to no known problem. My computer chimes at startup after a PRAM reset and never again after that. Does anyone feel comfortable or uncomfortable with this acceptance?

Uh-oh. I returned from a trip to find my Mac did not chime on powering up the other day. Just now it didn't wake from sleep after dinner. It finally restarted after I held the power button for a while, but again no chime, although I do have the white apple/grey screen that you're talking about.
It's not looking good.
Verify Disk found no issues. I was kind of hoping it was from the recent update with the Mac App Store, somethign that would be fixed with the next update.
Looks like it could be a hardware issue even though this thing is just 21 months old.

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