MacBook not waking up after sleep

I have a new MacBook, less than a week old.
Sometimes after I open my MacBook after sleep, nothing happens. Only the light on the front turns off but the display does not turn on and I don't hear that noise that Apple computers always make when wake them up or turn them on. I can hear the computer on but nothing is happening. I have to hold down the power button to reboot.
What should I do?

I had the same problem, sometimes three or four times a day. You may try "resetting your PMU" -- I did this on suggestion, but continued to have the problem.
I created a new user account and kept all of the default settings, and started using only that account for a while. The problem with coming out of sleep went away, and things were fine for a week so I assume it is something software-related. I switched back to my desired user login now, with still no idea what might be the cause of the problem. If I had to guess, I'd say it's a user-configurable OS setting, or application that cannot recover from sleep mode, that hangs the OS.
I saw on another thread that using "Secure Virtual Memory" is maybe the root cause of some graphics problems (video driver issue). If true, maybe it also causes the "failure to wakeup" issue. Some have also suggested the wake-up issue can be avoided by turning off "require password to come out of sleep mode." I have not tried this; I need security and the ability to lock my desktop.

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