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There may be a few issues her, try changing the contrast andbrightness of the screen, this can be done by using the buttons on the monitor,check any documentation you have if you're having trouble.
If this doesn't fix it could be a monitor problem for your videocard itself. Try using another monitor,if possible, to test your video card or try your monitor on another pc/laptop.
If the monitor works fine on another machine then chancesare it's a problem with your video card, it may even need replacing.
Flyback is a step-up transformer multifly the voltage depends on the size of the tube and supplied high voltage to cathode ray tube.The minimum output voltage of this is 14000v DC for 14 inches crt monitor what if your crt is 17 inches 17000v DC very dangerous if you are not electronics repairman.
What has happened is part of your back lighting circuitry has gone out. Yes it is repairable but can cost most of what a replacement monitor will cost these days. Check that out before spending the money. If the problem is only in the back lighting circuit then expect to spend about $100 for a replacement board.
LCD monitors lifespan depends on the quality. Normal use and you should get 2-3 years of reliable service minimum. The display itself is good for about 4000 or so hours of use or more. The problems that show up are always (well 99.99% of the time) are back lighting problems like you have experienced. You should turn it off by the switch when not using it as every hour it runs the screen save is an hour of usable life. Heat is not good for it so if your computer gets the dust cleaned out to keep it cool do the monitor at the same time. Once a year at least more if you smoke use gas heat and have pets.
Tube monitors have a much longer life but you have the size weight and poorer display to go with them. If you have to go back to a tube monitor don't go back to your 14 ask around and you should be able to get a 17 or 19 crt for free. Or expect to pay no more than $10-20 for one.
Monitor sizes are measured on the diagonal from corner to corner.
A 17" LCD may have a screen width of 12 inches measured from side to side.
If you are measuring a old style CRT monitor (Cathode Ray tube) the visible screen area will be about an inch less as there is about 1/2 inch of plastic frame holding the CRT in the chassis. The manufacturer can advertise the actual size of the screen regardless of how much is actually visible to display information.
If you are talking about software not utilizing all the available screen area to display the image, that is an issue with the people writing the software code not keeping up with the changes in hardware.
In the past year or two, most displays have switched to the 16:9 and 16:10 wide aspect ratios while most web content is still written for the 4:3 old style aspect ratio. Eventually, software developers will catch up with cusrrent hardware.