Base from the description of the problem, this is a clear sign of a monitor going bad already and may need some part replacement to make it working fine again. The best way to resolve this if you still want to continue using the monitor is to have it fix from a service center because it requires opening the monitor and check the inside parts and possible part replacement.
Your computer monitor or laptop screen will enter sleep mode after your computer remains idle for a set period of time. You can disable sleep mode if you prefer the screen to remain illuminated. You merely need to change a setting in the Windows Power Management properties box.
Difficulty: Moderately Easy
Instructions
Click "Start" and "Control Panel".
Click "System and Security" and "Power Options". This will bring up a new dialog box.
Click the menus to the right of "Turn off the Display" and set them both to "Never". This will disable sleep mode.
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thanks, that's what I'll do
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