I shut it down when I go to bed at night, and start it up first thing in
the morning. It has a nasty habit of freezing in the first half hour
after boot-up - typically after about 10 minutes. When this happens,
whatever was displayed on the screen is still there, but all animation
stops and there's no response to keyboard or mouse - not even
Ctrl/Alt/Del. Unplugging and re-plugging USB devices has no effect. The
only way that I can find to recover from this is to hold down the power
switch until it switches off, and then start again. After starting the
second time, it is invariably ok for the rest of the day.
I go through periods where it does this more or less every day, but
sometimes it can go for a week or more without a problem.
My hunch is that the processor is still running, but is stuck in a loop
waiting for something to happen - which never does - so it just appears
frozen to the outside world. Can anyone suggest anything which I can
look for after the event (log files, etc.) which might throw any light
on what's happening? [Or, better still, how I can unfreeze it without
having to re-boot!].
 I tend to display the clock from "Set Date & Time" at the bottom RH
corner of the screen. This way I can see that it is frozen, because the
second hand stops moving and, if I'm away from the computer, I can see
exactly *when* it stopped.
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