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Open monitor and look at power supply board for capacitors which are "balooning" or deformed in any way. These look like cylindars on the board. These tend to dry out and make what you are describing occur. Replacing them usually fixes about 80% of the problem you are describing. Those parts run about $0.25 to $0.75 each.. well worth trying, right?
Go into power options, select hibernate and uncheck the box to the left, this will disable the feature, microsoft worse piece of software. This will free up disk space and improve performance, best of all no sleeping computer to wake up.
If pressing down and holding the restart/start button doesn't wake it up you might try Control + ALT + DELETE keys (together) - that will reboot it though. And if that won't work then you might have to pull the battery to reset it.
It seems that some laptops have a problem with vista and sleep mode, in particular, and sometimes hibernate too. You can try going under POWER OPTIONS under Control Panel and setting everything back to default, saving it, then resetting it again. Also it's best to avoid using sleep mode if possible to avoid problems.
If the problem developed after a recent install or updating you may need to go to an older store point to fix the problem. Personally, I just avoid using these settings as much as possible and use regular shut down and a screen saver for times when I need to step away from laptop for short periods of time.
Usually indicates first signs of LCD going out. Must replace monitor or replace parts inside the lcd screen.. Both are costly and the best way is to replace the screen but depending on the age of the laptop you are better off investing in new low end model. Most laptop screens go from 150-250 and newer lower end laptop goes for 400 so tough call.