Blank after opening gray screen

I have a MBP 17", and after the recent system update that was offered (and I installed), my display is acting screwy.
When I start up, I get the opening gray screen with Apple above the rotating dial. At the moment that it should pop up with my desktop, the screen goes black. The keys still work, and I think the system is properly completing the bootup, as I hear the "bonk" sound when I hit the escape key, etc. I've hard rebooted, reset the PRAM, all the usual troubleshooting. But I just can't get beyond the gray screen to my desktop. Any ideas?

Aha! I called Apple & got my answer. (I try the boards first.)
He told me that it seems my power management settings may have gotten messed up. Here's how he helped me through.
Disconnect all power (remove laptop batteries, too).
Press and hold the power-on button for 15 seconds.
Reconnect power, and startup the computer while zapping the PRAM. (Hold down "command" & "option" & "P" & "R" all together immediately after hitting startup button and BEFORE the first chime.
Hold the buttons through the second chime, then release.
My MBP chimed once more, then viola! My display was back up.
Hope this helped.
Bill

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Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.
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b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
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Boot in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 5.
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Step 4
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 5
Launch Disk Utility in Recovery mode (see Step 1.) Select your startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
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Step 6
Reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 7
Repeat step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a Time Machine or other backup.
Step 8
This step applies only to older Macs (not current models) that have a logic-board ("PRAM") battery. The battery is distinct from the main battery of a portable. A dead logic-board battery can cause a gray screen at boot. Typically the boot failure will be preceded by loss of the startup disk and system clock settings. See the user manual for replacement instructions.
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If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store to have the machine tested.

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Hey Man I have the same problem, One day the screen just went black and from then onwards it has been reall problematic, I went to the apple store but they wanted about 100 bucks to have a look at it, although they did a diagnostic for free, but it didnt reval anything.
They said it was either the screen or the graphics card, and each one cost 750USD but 100USD to find out which........ I didnt fork out the cash though, a bit expensive!!!!!!!
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