This would most likely be a overheat issue. The heat causes the lines and discoluration, and random shutdowns. you could try purchasing a cooler pad (a pad the laptop sits on that has fans to try and cool it down. chances are, may be time to get a new laptop. you can purchase a new laptop that has a duo core processor, 3 Gbs of ram, and a dual layer burner for about 400-700 $ now.
this one for instance http://www.bestbuy.com/site/olspage.jsp?skuId=9180236&type=product&id=1218046802791
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Either you can hook up an external monitor or access BIOS setup (Basic Input/Output System) to replicate if the horizontal line appears. This step will check if the problem is with the video card or the LCD.
If you get the horizontal line on the BIOS or never get it on the external monitor, then surely the LCD screen is beginning to fail. You need to reinsert and/or replace the LCD inverter or LCD itself.
However, if you see the horizontal lines on the external monitor but not on the BIOS, try to update the video driver. If this will not resolve the issue, you need to replace the video card or the motherboard of your laptop.
It sounds like your LCD is starting to go out - the screens are usually sectioned off in thirds or quarters, so when a third or a quarter starts having trouble, it's probably time to either replace the LCD, or replace the computer - because of the age of that laptop, it's possibly going to be cost prohibitive to replace the LCD. You can, however, hook it to a desktop monitor and continue using it just fine.
LCD needs to be replaced. if you are very tech savvy you can reseat the lcd cable. but 99% of times it doesnot do anything. its the lcd that needs to be replaced. to see how to reseat the lcd cable. select your computer model on sony vaio website and then go to drivers and downlaods and then go to user manuals and then select adding or repalcing the parts and then you can find the way to do it. i suggest get the lcd repalced. before you do try this 1 step.
connect an external monitor, and start the computer and then press fn + F8 or try to extend the view to external monitor, if the image is okay, then its the lcd if you see the lines on the external monitor (which is 1% of 100 %) then its the motherboard.
all the best.
A horizontal line on your LCD display is either caused by the video chip on your system board or the LCD screen itself. Either way it will not cause you to lose data on your hard drive. It is a video problem.
By connecting an external monitor from a desktop PC to the back or side of your notebook and switching to it by using your function keys (see manual), you can see if the problem is also on the monitor (meaning video chip problem) or stays only on the notebook LCD (LCD problem).
The video chip problem means you will need a system board. The LCD problem means you will need a new LCD panel. In rare cases, reseating of the ribbon cable on the back of the LCD panel will fix the red line.