Strange.. Try cranking it on full and restarting, see if that changes it.
EDIT: Check this out, might help the problem StartupSound Preference Pane
Awesome. I had the same problem plus on bootup my iMac would stay at the white screen for a long time before moving to the white screen with the gray apple.Did you try Resetting your Mac's PRAM and NVRAM?
Did you try Resetting your Mac's PRAM and NVRAM?
Since you can't hear the chime and count them, try holding those keys down for a minute, a minute and a half or something, then let it go to a normal startup process. Restart normally again and see if that fixes it.