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I have seen this happen on desktops where multiple monitors (or monitor and projector) are used.
As odd as it may seem, if you have a "sleep" button or a function key on your keyboard to put the computer to sleep... press that. Give the computer 30 seconds or so to actually go to sleep. Then press the Enter key to wake it back up.
Usually, upon wake-up the correct monitor will work.
I don't know why this works, and I suspect its only when a monitor or projector is plugged into the VGA port that it happens. Give it a try, no guarantees.
If you have any kind of secondary monitor or projector plugged into the VGA (or any other port, for that matter) try unplugging it before turning on your computer.
Connectthe power adapter to the power jack on the side of the laptop. Plug thepower adapter into the wall. Confirm the power cable is secured to thepower adapter.
Openthe lid to the laptop. Move or touch the mouse, tap the keyboard, orpress the power button to attempt to wake the computer from hibernationor sleep. Wait at least 30 seconds.
Click "Start." Click "Control Panel." Type "power" into the search field. Choose "Power options" from the results.
Select "Choose when to turn off the display" from the left pane. Click the drop-down menus next to "Turn off the display."
Select a time to turn off the display after a period of inactivity. Click "Never" to keep the display on at all times.
Clickthe drop-down menus next to "Put the computer to sleep." Select a timefrom the options, or click "Never" to prevent the computer fromentering sleep mode. Click "Save changes."
Tips & Warnings
Ifyou own a Toshiba A210, A215 or P205D model laptop, you may need toupdate the BIOS. Go to the "Support" page on the manufacturer'swebsite, enter your computer's information and click "SupportBulletins." Review the documents for any notifications related to theBIOS or display.
Some laptops come with a "Hibernate" or "Sleep" button which wake the PC from hibernation.
Goto your computer manufacturer's website and review your laptop's onlinemanual for more information on waking your computer from hibernation.
please comment on this post stating how it help you with your laptops
Maybe the video has a problem, usually things like this can only be caused by 2 things, first is the memory or the RAM, try reseating, take it off then plug it in back, it. If this doesn't work most probably you have a video problem. Video problems are only to be fixed by experts.
This problem should not be only with your monitor, but also with your video card. You might have left one image sitting for long hours. There is no specific solution, but for Lcd users, you can try this. Leave the monitor off for few hours without any connection, maybe power chord or vga/dvi/hdmi cable. If this doesn't fix then the problem must be from your video card. You can try the monitor on another system to make sure, which one is the culprit. Your last choice is to reset the bios, to do this, remove the bios battery and leave it for few minutes outside (2 mins will do) and put it back. Reboot your system, this will fix your problem. Good luck. Thanks for using FixYa.
Check your network card properties through the device manager and disable the “Allow this devide to wake the computer” feature.
Right click on your “My Computer” then select Properties.
Click Device Manager on the left side of the Properties window.
Check your Network card on the Network Adapters (Click on the + sign to expand).
Right click on your network card and select properties.
Go to the Power Management tab and untick the option there to prevent your network card from ever waking up your Windows.
Find out what wakes up your Windows 7/Vista from its sleep
To find out what event/device woke up your Windows from its sleep state, go to command prompt (type cmd on the Run/Search box and press ENTER), then type this: powercfg – lastwake
To get the most detailed info (and probably easiest) on the device that wakes your Windows up during the sleep, type: powercfg –devicequery wake_armed
If it still doesn’t work:
Check out your Power Management Options on your Control Panel (Start, Control Panel, Power Settings, Change plan settings, Change advanced power settings). -> “Multimedia settings” option, “When sharing media.” ->”Allow the computer to sleep. -> Check other options one by one while you’re at it.
hold down the Fn and F8 keys, and it worked fine for me.
if your problem is you cannot wake from power saving mode (after your PC goes to sleep, then its probably just the driver for your video card). VISTA has some issues with certain drivers that the PC cannot wake from sleep
turning off all the power saving items does not help this- it just ensures that it doesn't automatically power down your hard drive or shut off power to your monitor automatically when you aren't using it.
May I suggest Hibernation Mode as an alternative? this mode saves everything you are doing to disc and shuts your computer down completely. when you turn it back on, it will restore what you were last doing onto the screen, so you can pick up where you left off.
you can find more information on this and sleep mode from here: http://windowshelp.microsoft.com/Windows/en-US/Help/335c6a5d-0304-4af1-b135-6bf6c124dc111033.mspx#EZAAC
I have called HP Technical Support 6 times about this issue and have logged at least 14 hours into the issue. The things they have done are turn all sleep settings in the "Power Options" in the control panel to "never". The problem persisted. Today, they sent my problem to the complaints department, so maybe they will have the authority to do something for my 5 week old setup.
For me, the monitor was in the "other devices" part on the device manager (go to start menu and type device, and the device manager will show up). I went to HP's website to the support and drivers spot and found a patch for the My Display program. This will allow you to uninstall your monitor, just right click the monitor under "other devices" and click uninstall. After you uninstall, restart and your computer will recognize the and put it under "monitors" in the device manager with the updated drivers. After I did this, the monitor hasn't gone to sleep.
It sounds like a driver issue, but more likely the monitor driver, not the video card, since the other monitor works properly. If you go into the video properties, check the monitor settings. You should be able to switch it to a generic monitor. You also need to make sure that you have the correct monitor refresh frequency set. If you have a mis-match, the video card could send signals at a rate the monitor can;t handle, which is why it won't "wake" even after a reboot and might need to be unplugeed to get it to come back on.