Most new computers have a restore function where you can restore your computer settings to an earlier date.I would also try rolling back my video drivers or uninstalling and then reinstalling my video drivers if I were you.
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More than likely it's the lcd screen and will have to be replaced. I
could be the video card, but most likely the lcd screen especially when
you can put pressure on the screen and cause changes. To isolate the
problem try connecting another monitor to the computer. Borrow a
monitor from a neighbor, friend, relative or co-worker and connect it to
the laptop. If the Borrowed monitor displays ok, then the problem is
with your lcd screen and the video card is ok. If the Borrowed monitor
displays the same as your lcd screen then the problem is with your video
card inside the computer.
Plug in an external monitor and see if the
display shows up on it. It can be any kind of monitor even the old big fat crt
monitors as long as it has a vga cable to connect to your computer's vga
port. If so that proves your video card is ok. The video will show
on most systems when you reboot without you having to do anything. Some systems
will require you to hit the FN (Function key) + F1 thru F12. Hold down
the FN key then hit the correct key for displaying on the monitor (F1 thru
F12). The correct key will normally have CRT/LCD on it or it will have
the icon of a display.
Once you narrow it down to the lcd screen as being the problem
you might try taking the lcd screen apart to reseat the lcd cable on the
back at the top of the lcd. Just unplug it and plug it back into the
connector. You can also try doing the same where the lcd cable plugs
into the motherboard. Just pull it out and put it back.
This the problem related with LCD. Horizontal and vertical line occur, the cause of LCD data strip disconnected. If you are able to open the LCD bezel and back cover then look display data strip that is connect with LCD. if you need more then hit me mail,I'll be online on fixya.
You can get a mini display port on the side to either vga or dvi out so you can hook to an external LCD and this will tell you for sure either lcd or inverter but its hard to say if its lcd or inverter but the inverter sometimes is part of the display. Do you havea serial # i can try look it up see if have inverter sep
Which mode are you shooting in? You may have adjusted the exposure compensation so everything is washed out.
Whatever the cause, your images are overexposed. Try shooting in auto and the camera should take over the settings, but if you are in other modes, check your shutter speed, aperture, & ISO also. These are all things that can cause too much light and wash the picture out/OVEREXPOSE.
If you have any other questions or can give me more details, just ask!