Okay, so a while ago I lost my startup chime about the time of the latest HS update. I've tried everything to get it back using sound preferences, SMC reset, NVRAM reset, etc... I get the bong chime when holding the comand-option-P-R keys, or the command-R or commando-option, even if it boots to the bootcamp partition I get the chime. Only when loading macOS HS is the chime lost. Thereafter I have to command-option-P-R again to bring it back even to a windows boot. Anyone????