Cyan screen when MBP comes out of sleep or power on.

For around a month now, my MBP's screen has been going a Cyan colour, and sometimes with a green now and again. This usually happens when it comes out of a deep sleep or when I power it on. I took it to the Apple store and they said that there are no hardware issues, so it must be an app that it causing the problem. It was assumed that 'Flux' was the cause, an app which changes the colour and brightness of the screen to lessen the strain on your eyes when looking at the screen in a dark surrounding. I was recommended AppZapper to get rid of the app and it's connections, which I did. The problem didn't happen for a day or two and now it is back again. I read somewhere that a broken fan may be the cause, as a buzzing sound is coming from the inside of the laptop, which does sound like a hardware issue, which I mentioned at the genius bar but as it showed that there were no hardware issues when we tested my MBP, nothing was thought of it. Does anyone have a solution to this, or know what the cause may be? Thanks.

-Matt wrote:
It was assumed that 'Flux' was the cause, an app which changes the color and brightness of the screen to lessen the strain on your eyes when looking at the screen in a dark surrounding.
The purpose of Flux is to lower the screen temperature (blue spectrum) at night so your computer monitor doesn't keep you awake by stimulating the pituitary gland in your brain that controls the sleep cycle.
It is important to make sure any software like that (especially) works with your currrent machine and OS X verison before using it.
The Mac has it's own controls in System Preferences > Displays to adjust the brightness and automatically dims the display to not be as bright at night.
I was recommended AppZapper to get rid of the app and it's connections, which I did.
Using this program is always a mistake, because it does a search only, thus other files are flagged and the use assumes the zapper knows what it doing and then deletes essential needed files or it doesn't catch certain files.
I read somewhere that a broken fan may be the cause, as a buzzing sound is coming from the inside of the laptop, which does sound like a hardware issue, which I mentioned at the genius bar but as it showed that there were no hardware issues when we tested my MBP, nothing was thought of it. Does anyone have a solution to this, or know what the cause may be? Thanks.
What likely occurred is you missed something to uninstall in Flux, and/or it's not compatible with your OS X/machine or AppZapper deleted a unrelated necessary file.
It's also possible you either have a bad fan that's striking it's own enclosure, or something got inside the machine, which wouldn't show up on the hardware tests.
I would start out by going through the Steps #1-#8 here, this will fix OS X if you deleted a essential file out of it, also kick out anything by a possible incomplete uninstall of Flux, reset the SMC and PRAM etc.
Step by Step to fix your Mac
Next I would check with the Flux developer about finding out where all the parts of Flux are, and it's manual uninstall method, any issues with your machine/OS X version, then use the free Easy Find to locate the orphaned files in your Applications or User folder if there are any. The #8 Step above will refresh OS X, so no need to look there.
https://s3.amazonaws.com/DTWebsiteSupport/download/freeware/easyfind/4.9/EasyFin d.app.zip
Once that's been done, if your still having problems, then have Apple open the machine up and inspect the moving parts.

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Message was edited by: SFR6

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Cyan screen when MBP comes out of sleep or power on.

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