I just found out more information about this restart problem. When I restart from an installer dialog that asks me to click on a button to Perform a restart, it does actually restart...eventually. What it does is appear to shut down and quietly starts up again without the chime. To all appearances it needs a jab on the power button, but it really doesn¹t. The start up shows a black screen until suddenly the startup window appears with the progress bar and the login window appears very quickly. jg