MacFreeze-up! :-(
This is a recurring but erratic problem. My Mac freezes. No menu or shortcut combination works. Safari is in front. Music in a hidden tab is playing. The current tab was booking a flight for me and a pop up info panel was displayed. Now cannot click on any input field. Menus dead. Mac seems totally dead. Cannot ALT Tab. But music still playing, so the OS is alive, but somehow frozen.
Mac OS 10.10.3
Safari - latest ver
iMac, OS X Yosemite (10.10), iPhoto 9.6