MBP Display turns black after login

Hi,
When I wake up my MBP (15'' 10.4.10, Core duo, ATI Radeon), login, the screen
sometimes (may be every 4th time) turns black, but the MBP seems to be awake.
When I put it to sleep and wake it up again, it works fine. This seems to happen
more often after using a video projector.
May be the password was entered incorrectly, may be not. But it did not turn back
to the login screen either.
I don't have this issue with my iMac (different use though).
Any advise?
Thanks,
Dirk

Your issue sounds like the same issue i have on my 17" MBP. Are you waking then having to log in to wake from a screensaver?
I have my computer set to ask for authentication after it wakes and every once in a while, i'll wake my computer, and the authentication window immediately pops up, i proceed to put my password in then it goes back to black, although sometimes, it will the show the mouse cursor.
I dunno what happens, but I have noticed that when I do wake it up, the optical drive (i think) makes a noise as if it were reading, and that's usually when i get the black screen.
Anyone have any fixes? Could this be a video driver or hardware issue?

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MBP Display turns black after login

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