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Sounds like a hardware issue. Make sure your settings on your computer are not causing it. If its not your settings then it is a hardware issue with the monitor which sadly means you will have to send it to the manufacture or someone who does hardware repair.
The best way is to buy a special microfibre cleaning cloth for LCD monitors. Very often the same cloths are used to clean sunglasses so you may already have one of those. Do not use any cleaning liquid. Rub the screen very GENTLY with the cloth until the prints are gone. You can rub fast but remember not to press too hard or you can damage your monitor.
To use the external vga connector of a laptop, you have to activate it. In many notebooks it is Funtion and F7 (Fn-F7). In your notebook it may be F5 or F6, look for a monitor sigh in the F keys.
The activation may sometimes rotate in sequence , ie, External + LCD, LCD, External... and so on.
Just check that your monitor is not set to power down(Control Panel> Power Options) and check that the 'Turn Monitor Off' Power Scheme is set to never and turn off any screensaver to see if it still goes off.