Display won't always turn on when I turn the computer on

A problem I encountered yesterday: when I put my Mac to sleep, then try to wake it up, I hear the Mac wake up (and see the light on the front), but the monitor doesn't turn on. If I turn the computer off, then turn it on again, the monitor only turns on sometimes, maybe 50% of the time.
I have a 10-year-old Viewsonic 20" CRT. I plugged in my roommate's new 17" flat screen, and I could not duplicate the problem.
My monitor has a USB hub in its base. I unplugged that USB cable from the back of my Mac, and that seems to have solved the problem.
Any ideas on what's causing this? Thanks.

Well, I just encountered the problem again, so I guess the USB hub thing isn't involved in the equation.

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IPhone says 'Connect To iTunes' but won't turn on when plugged into the computer.

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Start up in Safe Mode.
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Select your preferred language.
refer to this Apple supprt Article on the 5Rs
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martinfromdevon wrote:
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Display won't always turn on when I turn the computer on

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