Not sure why this is- its only just happened haven't moved the computer its just like a white stripe from top to bottom in the right half of the screen anyone know how to fix this or know what is the problem
Re: inch wide vertical white band on my Imac screen?
I have some good news and some bad news for you. First the bad news. the LCD panel in your unit is damaged beyond what 95% of people could fix at home. what has basically happened is the very very thin signalling cables that run around the edge of the screen is damaged. your only option is to replace the panel, which can be a major hassle unless you are very comfortable with a screwdriver and have at least disassembled laptops and know what the parts are. Bad news as well, part is about $150.
good news. most shops can do this repair for you, esp. if they deal with laptops.
I can give you the replacement info if you wish to attempt it yourself, but as i said, it can be a hard repair to do.
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Unfortunately, vertical stripes, most likely 2 inch wide, are indicative of GPU failure. The failure is cause by the GPU slowly detaching itslef from its mountings. This process made more common by the introduction of lead free solder. IF its under warranty... take it to Apple, if not, it's doomed. There are fixes available know as 're-flows' or re-balls' .. whilst these are different processes entirely, neither is a sure fix, and neither, if it works, are guaranteed to last more than a few months.
This very likely a failure in the LCD screen. If you are seeing thin or wide bands, vertical or horizontal across the screen, then you will need to have the unit serviced to repair or replace the screen. If the unit has been dropped or struck (hard) it is possible the connector cable for the screen has come loose, but this is not usually the issue. If the unit is still under warranty, get it serviced. If it is not under warranty, there are several good web sites that provide Do-It-Your-Self instructional videos as well as parts, both new and refurbished and used. If you google your specific model and "screen replacement", you will see a number of results appear that would be of use.
Try a reboot. If it remains, shut down and leave off for about an hour. If it comes back you probably have a problem with your video card. You can have it replaced (it will be pricey though), or consider getting a new computer. I had a similar issue with an Intel iMac 24-inch out of warranty and had the card replaced but your machine is much older.
First, plun a external monitor and toggle the screen with ALT+F5. This will determine if you have a hardware or software problem (drivers, configuration, etc).
If the image in the external screen is correct then the problem is in the LCD panel or its cabling.
Here you can get the replacement LCD panel and change it yourself.