Some keyboard shortcuts are used during startup to modify the boot process. For instance, Command - S will invoke 'Single User' mode. See here... http://support.apple.com/kb/ht1343 Oftentimes there is a delay in the action, and I am not sure if I got the timing right. I have an iMac 3.06 Ghz Intel Core 2 Duo running OS X 10.6.7 with a wireless Bluetooth keyboard. Question --- When does the Bluetooth become active during the boot process?? Thanks, Ray Raymond P Reedy speedyrjax at gmail.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://listserver.themacintoshguy.com/pipermail/imac/attachments/20110531/587823e9/attachment.htm>