How long do you leave it before you close the emulator? In my personal experience, I found the emulator long enough (even up to a minute, sometimes longer) to fully boot to the main screen.
I would advise you to wait a little longer to make sure that you do not close it before it boots.
Edit:
Have you also tried looking at the magazine at the bottom of Eclipse? If for some reason there is a problem when the emulator is fully loaded, there may be some kind of error message posted there to inform you.
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