Computer wakes from sleep but screen remains black even after restart

So, I installed SL yesterday and everything seemed fine. Last night, I closed my computer's monitor (putting it to sleep) for the night. This morning, when I opened it, the screen was black. I could not see anything, so I just restarted the computer.
On restart, the screen remained black.
After some experimentation, I realized that the computer was actually running, but I just couldn't see anything. So, I typed my password - screen was still black.
I then pressed the power button and enter - shutting down the computer properly.
After it shut down, I turned it on and the screen came on as normal...
What's going on here?
I checked some other threads and there was some potential issue with the iphoto screensaver, but I am not sure if that is the case here or not.
Any thoughts on how to fix this or prevent it form happening in the future?

I just had a similar thing occur. After resetting the pram the screen came back on.
I had noticed some problems with the hot corners for sleep mode earlier so I have deactivated them now to see if this was the problem. The only other thing I can think of is the recent Java update. I installed it right before the problem occurred.
Kurt

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Screen remains blacks even after waking up from Sleep mode

Hi,
I've had my Macbook Pro for over a year now and it hasn't given me any problems until recently. The screen would remain black when I open up the laptop to wake it up from sleep mode. There would be no response even when I press random keys. When I close the laptop again, the white light at the bottom right corner lights on (when it's supposed to "breathe" while sleeping). The light goes out when I open up the laptop. The only thing I could do is to restart the computer.
What is the problem? Are there any ways to rectify this?

I am going to add my problem to this as I believe it fits and may add to the conversation.
I have a MacBook Pro, am using Parallels, and have an issue waking it up from sleep.
Circumstances:
I close the lid and walk away from the device in my office. When I return, (over night or an hour later) I open the lid, and if nothing happens swipe the touchpad or press a key, the power light changes from pulsating to steady. then in less than 15 seconds it goes back to pusating. The display never energizes, only remain black.
I usually try opening and closing several times, and occaisionally that will work. Other times, I hold the power key until I hear the drive halt, then turn it on. The grey screen will display, then blue, then just before it gets to the log in, the screen goes black (not energized) and the light pulsates.
I have tried the PRAM reset and Safe Mode starts with no luck.
*Now the really wierd thing.* I decieded to contact Apple support on line and pay for help (yes that is weird in an of itself for me). As I began the process it came to the part for me to enter my serial number. With the lid open, I turned the MacBook on its side to try to read the number and the screen energized and the password unlock prompt was waiting for me to enter the password.
Observations
I had read where the light sensor could be blocked by dirt or the light in the room was too dim, but I clean the screen and there is plenty of light. Dales Post is the first that I have seen Parallels and the Sudden Motion Sensor. That makes some sense to me because of what happened when I turned it on its side. I have verified that it happens regardless of using Parallels. as teh last time I did it I had closed out of all my VMs and I believe exited Parallels.
I am going to try the deleting the power preferences file and will report back.

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O.k., so I also had this problem when I updated to 10.6.8, but it's still here in Lion.........
When the computer wakes from sleep, I get a single flicker along the bottom 1/3rd of the screen, then everything's o.k.
It's just annoying, that's all. I've backed out to 10.6.7 on 3 occasions, and the flicker disappears.
Anyone else having this issue?
I'm running a 2010 Quad-core Mac Pro with SSD and 27" Display.
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Update:
I've now been to the local Apple store, and tried their display Mac Pro/27" Cinema Display combo, and guess what.......the screen flickers on wake-up.
I asked the guy in the store about it, and he says "oh yes, I see that. No-one has noticed that before, I wonder if mine does it at home".
I tried the Mac Mini with 27" Cinema display, and the 27" iMacs, and they were o.k. (no flicker).
So, this only affects Mac Pro's running 2560 x 1440 resolution.
I've booked another call with Apple Support. No doubt they'll still tell me to take my computer in for testing, even though I've shown they all do it (the guy in the Apple shop suggested that, even though I demonstrated the flicker to him on the one in the shop).
I wonder how long this will take to get a software fix? Problem is, the Pro is not mass-market (like Macbooks and iMacs), so it may take an awful long time.
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Bob.

Display Changes Resolution When Computer Wakes From Sleep

I have a MacBook Pro bought in May of 2006. In the last year, this problem has been getting progressively more annoying to me. When the computer wakes from sleep (not every time, but most of the time) the screen will flash blue, then reset the resolution to 640 x 480, I think. To fix it, all I have to do is go to System Preferences and change the resolution, but when I do that, it pops up two windows, like it thinks I have a dual display set up. To fix this, I always click 'detect displays,' and it fixes it, but the next time I wake the computer from sleep, it does it again. This isn't really an urgent problem, but I would expect my computer to behave a bit better for me.
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Hi Lisel. I have a similar age MacBookPro that does the same thing. I don't really know how to fix it I'm sorry, I wish I did cause it's annoying. I just thought I'd let you know you're not the only one with this issue.
Basically, for some reason it thinks it has two displays connected, even when there isn't. To stop it being a total pain, make sure when it does come up with the two Display Pref windows to set them both to 1440x900, at least then when it does go dual display it won't be 640x480 and you can still read stuff.
I've also left the Display Pref icon on the top tool bar (next to the AirPort and Bluetooth and stuff), so I can just click that and Detect Displays. When it does that it figures out for itself it doesn't actually have two displays connected and so goes back to normal.
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My computer wakes from sleep (MBP 10.6.4). At the time my computer wakes (not exactly sure of this), a message in the Console reads "Focus[143] Screen parameters schanged". When I open the lid, the keyboard is lit-up, the screen is blank and the is no prompt for logging in. I have to hit escape, close the lid, wait until I see the computer sleeping, open the lid, then I can log in. I have a program on my Mac called Focus, could this be the culprit or is it something in the OS itself? Many times when this has happened, my computer fans are screaming and the computer is very hot. I have been eliminating many bugs from my system but this is one I need some help with. Thanks.

Focus certainly sounds like it could be the culprit. I would remove it from your account login items an test to see. You do this in System Preferences>accounts>login items tab. You'll have to unlock the preferences and enter your admin password and then select Focus in the list and hit the "-" button below the list.
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On my machine (FW 800), 10.4.7 caused: machine to slow perceptably after wake from sleep. Activity Monitor tells me kernel_task is consuming hundreds of times it's normal CPU cycles.
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Hi,
my MBP 13" Mid 2010 running 10.6.4. has similar problems. I like to use it closed lid connected to an external display with apple usb keyboard. In closed lid mode airport connection fails several times or I do get a poor connection, e.g. one or two curves in the airport menu bar icon with significant lower connection speeds. I do connect to a airport extreme n station with does its job rock solid. as my wife uses a two year old macbook and I have got an G4 with a sonnet airport card running both without problems even from a greater distance in our home it seems to me that the macbook pro has serious problems operating with the internal wifi antenna in closed lid mode, maybe due to shielding from the lid?
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solved!
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Computer wakes from sleep but screen remains black even after restart

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