What is messed up when the speaker icon red "X" doesn't go away?
When my Win 7 64-bit Home Premium system boots normally, the speaker icon with have a red "X" over it briefly, then the "X" disappears, as it should.
But when some sort of crash happens, upon re-booting, sometimes that red "X" stays, and various startup programs also fail to start correctly.
So far, a system restore from a restore point from before the crash fixes the problem, but I'd like to know what has actually gone wrong, and if there is a way to just fix the actual problem.
Somehow I haven't found a good discussion about what leads up to the speaker icon appearing, and what has to happen for the "X" to disappear.
Can someone kindly point me to where they've found such information?