Screen is half normal and half darker.

The first half hour my screen is half normal and half darker. What can be the problem?
It started after a replacement of the protection screen at the Apple-dealer in Marbella.

Hello benvanoeteren,
After reviewing your post, it sounds like the display is not working correctly. I would recommend that you read this article, it may be able to help the issue.
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Brightness or color isn't uniform
If you have an older display, before evaluating the display for uniformity in lighting or color, the display may need to warm up. Older LCD (Liquid Crystal Displays) use CCFL (Cold Cathode Florescent) backlights. This kind of lighting may require several minutes to half an hour to warm up fully.
Thanks for using Apple Support Communities.
Have a nice day,
Mario

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Symptoms:
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Is the problem the led screen, backlight, connection, motherboard or something else?
Hopefully someone has seen this same problem and can help. Thanks!
Here is the video for reference.
http://www.youtube.com/watch?v=0O2cx9T4DI8

Yesterday I decided to open up the lcd assembly to examine and copy down the exact part # of my led sub card and lcd screen. I thought it had to be the sub card or lcd panel. But as i observed b4, the lcd would work fine for hours as long as the laptop was on a stable flat surface, which led me to believe the lcd should be ok.
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I turned it on and lo and behold, the screen has been working perfectly for the last 24 hrs. No dimness, no blackout.
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You really should contact Apple or your local AASP and have it checked out.
Apple - Support - iMac - Service FAQ

Hi, I downloaded Yosemite this evening. I downloaded o.k., it installed o.k. and then it restarted the Macbook and now it seems frozen. There is nothing but a grey screen, the apple logo and a bar that is half black

Hi, I downloaded Yosemite this evening. It downloaded fine, it installed fine and then it restarted the Macbook. Now it seems to be frozen. I have nothing but a grey screen with the apple logo and a bar that is half black and half grey. It's been like this for over an hour. Should I worry or is it still working at something? How do I fix this if it's not still working at installing something. Thank goodness for this poor old pc as backup.

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
To restart an unresponsive computer, press and hold the power button for a few seconds until the power shuts off, then release, wait a few more seconds, and press it again briefly.
Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
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Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If a desktop Mac hangs at a plain gray screen with a movable cursor, the keyboard may not be recognized. Press and hold the button on the side of an Apple wireless keyboard to make it discoverable. If need be, replace or recharge the batteries. If you're using a USB keyboard connected to a hub, connect it to a built-in port.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
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Step 7
If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
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The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
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Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
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Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
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Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
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Step 12
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Try the standard fixes:
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We are just users like yourself. If Apple has stated publicly about the problems you mentioned, it will be listed on their website and/or in one of their Knowledge Base Articles.
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Think of these forums as a hospital emergency room.

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Hello, to change the size (I have six icons per row not five) go to options>advanced options>accessability and change the amount on the grid. Default 6x6, then 4x4 3x3 etc., you can also change the colours. Hope I`m not barking up the wrong tree but have bbn of help! Regards Kew

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Also, the Caps Lock doesn't always work, even though there doesn't appear to be anything wrong with the button, it only works selectively.
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When you next have the problem, note the exact time: hour, minute, second.
If you have more than one user account, these instructions must be carried out as an administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
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When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
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IPod 4th gen's screen was glitching, now the screen is half white, but still works.

Hello everybody! I couldn't find the solution to my problem anywhere on Google so here I am and I really, really hope you guys can help me.
My iPod 4th gen has been acting up lately. Last night, the screen kept flickering and glitching. This happened the first week I got my iPod, but it stopped after a bit and it never happened again until now. I thought this glitching would stop after a bit, but this morning, I still found my iPod in the same state (if not, worse).
I think the problem is yesterday I plugged my iPod into my laptop and none of the USB ports could pick up my iPod so I plugged it into my ancient computer to see if there was something wrong with my cord, but my computer was able to pick up my iPod and so I left it there to charge. I also downloaded the latest version of iTunes onto that computer because the iTunes on that one was really old. After, I plugged it back into my laptop and it worked again. What I'm thinking is that maybe the computer did something faulty to my iPod and messed it up. I think that's what happened the first time also when my brother used my old iPod nano charger (had it for five years) to use it to charge my iTouch.
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Thank you in advance.

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Screen is half normal and half darker.

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