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Burn is is usually permanent(must replace panel, NOT cost effective)
You may have a screen position in your menu to try to wipe it, where the screen stays all white or wipes across screen from black to white to try to clear it) If it is burned in bad enough now it is too late.
Lean the display as far back as you can and see if you can see the start up screen "shadowed" across the screen. If you can then the backlight burned out and you need to replace it. Sometimes a reall bright flashlight will help you see whatever's on the screen if the light burned out. Just hold the light up as close as reasonably possible to the screen and the icons and stuff should be visible. Another thing you can try is toggling the onboard/external video by pressing F4.
Please download and Run the BIOS update utility for resolve this issue. You can download it from the link below.
If the problem still persist, reboot the Computer and keep tapping the F2 key when VAIO logo appears on the screen to enter BIOS mode. You can manually disable the function System and BIOS Shadowing. This will resolve the issue.
Image burn can be permanent if the image was left on for a long period of time. You can try a pure white screen to balance the screen out. They sell DVDs online that have white screen and other screen correcting images to try an correct the damage done to your panel. here is one linked plasma or LCD both can burn.
best of luck
some times the florescent back light burns out or it could be a bad graphics card. If you think the computer is running but you can not see any thing on the screen try tilting the laptop towards a light and see if you can see shadows on the desktop. If you can see shadows then it is the back light. If you can't see anything then maybe your graphics card is bad
the reason why it went from burning everything to barely burning and now not burning is because the laser in your dvd drive is bad. It takes alot of power from the laser to burn dvd's and it only has so many hours that it can burn before it goes completely. Replacing the drive is the way to solve the problem. If you machine is under warranty then getting it replaced by sony shouldn't be a problem. If its out of warranty then getting one off of ebay should be pretty cheap.
If it is a CRT (Old glass tube set), the effect your describing can be caused by regular watching of 4.3 ratio images on a wide screen set over an extended period, leading to a type of burning-in. If it is an LED or similar more modern set, you can also get a similar burning in for the same reasons but you can also get some shadow-like effects at the edge if the screen isn't matching up to the illuminators at the edge of the screen - I would expect this to be top or bottom though, as I don't think anyone produces a TV screen with the lights at the sides, and this wouldn't impinge very far into the image. If it is an older flat screen set, burning in can again be the cause but so can pressure being applied by accident to the screen.
Degaussing isn't applicable if it isn't a CRT - but if it is a CRT and you know how you degauss the screen safely, it might be worth a go - but it won't do anything for burn in - once there, it's there.
Burning in on a flat screen - depends on how deep the burn is - if you are a dab hand ( or are just going to chuck it if you can't fix it) you could try replacing the plastic surface of the screen - but to be honest I would only suggest this as a last resort as umpteen things can go wrong and it may still be the same.