Sounds as if something within the monitor is overheating or a component (maybe a capacitor) is going bad. Either way, if it is under warranty, I believe Samsung has a 3yr warranty, it should be repaired by a professional.
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Welcome to FixYa! The default power saving feature is turning the monitor off. To change the settings go to the Desktop>Right click on it>Properties>Settings and you will see power saving settings where you can choose "Never turn off" or a longer time interval. These settings can also be found in your Control Panel for all of the Power Saving features for the computer, monitor and hard drive. Steve
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.
no signal indicates a couple things... i suspect your computer isn't even booting up. reboot the computer while tapping the F8 key.... you should see writing on the screen... boot to safe mode. after it sucessfully boots up... reboot again... should be fine.
please connect your laptop to external monitor. if it works with external monitor, then the problem is with your laptop monitor driver.if that is the case, then re-install laptop monitor drivers. if it doesn't work even with the external monitor, then re-install graphic card drivers.