Change the contrast on my LG screen FLATRON L1919S ?

type "driver LG FLATRON L1919S" in Google, you'll get the answer...

Failing internal components (but first before sending in for repair, check the computer graphics card is ok, as this, or the VGA cable to monitor may be suspect)
In effect what is happening is that the hardware that controls the spread of green and red pixels on the screen has failed (happens over time), this will need repair or more likely replacement

this is the site you need
http://www.lg.com/uk/support/product/support-product.jsp
Please let me know if you need any further info

Download here: http://flatron.lge.com/au/support/product/support-product-profile.jsp?customerModelCode=L1919S-SF&matchedModelCode=1400000261&searchEngineModelCode=L1919S-SF&initialTab=warranty&targetPage=support-product-profile

You should google this. After looking myself i have seen that it should play HD movies without a problem.

It means your PC video resolution is too high for the monitor to display, you need to set your PC video to the native resolution of this monitor, 1280 x 1024 @60Hz.
Start up in sfae mode (hit f8 while booting up), select VGA support, then right click on desk top/properties to bring up display property/setting. set the new resolution , reboot.

http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

for what purpose you want the driver for the monitor? generally there are no need to install the monitor driver.

It means your PC video output resolution is too high for the LG monitor to display (your old monitor (CRT) can handle higher resolution than this LG LCD monitor), you need to set the PC video resolution to native resolutionof this monitor which is 1280 x 1024 @60Hz. You may have to use the old monitor (CRT) to set the resolution to 1280 x 1024@60Hz, then hook up the LCD monitor.

you can check your lg panel on connecting it to some other cpu

This may be the problem with the lower version of direct X software. user directX 10 ver and also upated activeX version. The problem mostly soved