it depends on what OS you are using but if you are using Windows just right click the main desktop screen and scroll down to screen resolution for windows 7 and for xp go to control panel and it will be under display options.
Your screen resolution must have changed.
The backlight is probably has blown in the screen, unfortunately it is an integral part and cannot be changed separately, you will have to order a replacement screen, these are not expensive and you may be able to get one cheap online
I don't think this problem is related to a virus, most likely this is a hardware relate issue. Here are some troubleshooting tips. Test your laptop with an external monitor attached to the VGA port. If the external video is working fine then most likely there is nothing wrong with the motherboard or video card and the problem is somewhere inside the laptop display panel. Most likely you have a bad LCD screen. I doubt that this problem is related to the video cable because when you have a bad video cable it affects video on the whole screen, not just on the part of the screen. I guess you'll have to replace the laptop screen.
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Yes - the most likely cause for the screen not to work is that 1. Back-light burned out 2. Inverter (takes DC power and converts it to AC power for the backlight) has gone bad 3. or the video controller chip on the motherboard has somehow fried (highly unlikely) All three instances require the laptop to be dissembled.
From my experience, you may have one of two problems: -The backlight for the LCD has failed -The inverter board has gone bad At the bottom of the screen is a bulb and it is gradually dying just like a florescent light bulb You can replace the screen, but it can be a bit tricky. Prices run from 80-150 USD.
Usually they have a HD screen but they could have gone to the options screen and change the screen settings.
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When you log in to your computer (or have just turned it on)Make sure your NOT on the internet, right click and go down to SCREEN RESOLUTION. Change the resolution to the highest, click on apply an & OK and your computer will be back to normal.
Presumably you're talking about a laptop. There's a setting in the BIOS of most laptops called LCD Panel Expansion. If you enable that it will make the image full screen. If it's a desktop then you've somehow managed to change the CRT focus to a smaller area, just expand it to fill the screen again. If it's a TFT monitor then it should have a button which can auto-center the image.
The price has gone down and the number of options have gone up on today's best laptops. You may want to purchase a wide screen laptop, usually around 17', versus the standard screen which is around 15'. Many movies now use the wide screen format and will look better on a 17' screen. You will also want to consider a built-in DVD/CD drive to play your movies. Some laptops do not include a DVD/CD drive, requiring you to purchase an external drive. Also, test out the sound system to determine if you need headphones or external speakers for a better sound experience. You will want to try out the keyboard on each laptop you consider. Make sure you try typing in a word processor and perhaps in email to determine if the keyboard feels good to you. Try out the touch pad to make sure that it is easy and convenient for you to use. And make sure that the laptop you are looking at has a built in wireless device so you can easily connect to a network. Weight may be a consideration. Perhaps skipping the built in DVD/CD drive will lighten your load. Just be sure that your laptop is sturdy and built for travel so as to survive the perils of airport inspections. Be clear about the software that you need on your laptop because it can be expensive to buy separately. Look for package deals where software is bundled with the purchase of a new laptop. Availability of service and a warranty that covers wear and tear if you are on the road with your laptop are a good investment. Most retailers can give you this information prior to purchasing. When you know what you want out of a laptop, you will make a better purchase and will be happier with your laptop for a longer time.
It will depend on what has gone bad. If it is just be a loose flexible PCB /cable connection between the screen and the main board or the screen it self may have gone bad. If you are comfortable with small pieces of electronics and have some electronics knowledge, you will have to open up and play with the unit to see what has gone bad. - Neeraj Sharma