Upon powering my netbook on, its screen turns into a garbled display (has black/white patterns, horizontal line patterns, screen freezes and/or wrong display position). This distortion happens even at BIOS startup, continuing to Windows startup. Occasionally, the issue starts around 3 minutes after the Windows desktop appears.

Pictures of the monitor (click on image to enlarge):



  

More pictures at: http://imgur.com/a/ArME1

Details:   


This happens even in safe mode (the last picture above is of the
netbook screen in safe mode).  
I  connected the netbook to an external monitor (through VGA) and the display in the external monitor shows up just fine. I have been able to use the netbook without any issues with an external monitor.    
Aside from the monitor, the netbook still works (I can shut it down with keyboard shortcuts) and the files that it has shared through LAN can be accessed fine. The torrent client's web interface on the netbook can also still be accessed on another computer.  
The issue sometimes happens even at BIOS startup.  
The variations of the distortion will sometimes change randomly.   
Occasionally, the non-distorted screen display will simply freeze.
The netbook didn't fall in the ground or get hit by an object.  
The netbook is mostly used as a torrent seeder and downloader. Its lid is opened and closed around 2 times a day only, but the netbook is powered on almost 24/7 (its lid is closed most of the time). It is mostly accessed through another computer through LAN and is not often used directly.  
The netbook was bought around 2 years ago.  


What are the possible causes of this? Any possible fixes or methods of repair I can look into? The netbook is now out of warranty.

Netbook details:  


Model: Samsung NP-N150
OS:  Windows 7 Starter  
Graphics Chip: Intel GMA3150  
Monitor: Screen Size 10.1", LED Backlit
Other specs here: http://www.samsung.com/us/computer/laptops/NP-N150-JA01US-specs



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