Display keeps changing on it's own

For a couple of weeks now my Mac Mini keeps changing the display at random. I have changed the settings on the monitor itself and thru system pref. Nothing fixes it permanently. It looks as though it's going into some sort of zoom effect and the fonts look weird (almost like what windows looks like if you start in "safe mode"). I can do absolutely nothing, just walk away from the computer, and a few hours later go back and it will have fixed itself. Or vice versa. For example, this morning I'm on the computer, everything is fine. I walked away, it went into sleep, I come back hit the space bar on the keyboard to wake it up and I'm in zoom. ????? what is going on? Do I have some sort of virus?

Mine appears to be doing the same thing. I use reset to bring it back to normal. It does not matter if all programs are closed or not. It still does it. When I say reset I mean clicking on the Apple icon and going to reset not the command option r, p. Of course they may be the same thing for all I know as I do not know the short cuts very well.
I also have a RAM problem - the amount of RAM available keeps disappearing. I do not know if this is related or not - but plan to post this question in another community. I only mention it in case it might be relevant.

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Not much to go on.
What monitor and connection method are you using with the mac Mini..?
Have you tried resetting the > NVRAM and PRAM
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Why does the color on my calendar keeps changing colors on its own

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TS2784 I have set my iphone5 time settings to automatic New York time. Throughout the day the clock keeps changing times on its own by hours. Sometimes in is correct. Sometimes it is wrong.

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One of my questions was what happeens if you physically switch the monitor connections to the vido card?
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This is my first time on this forum, so Hi to everyone out there.........!
Anyway,
I have a G4 with a 30" display, everytime I boot up the 30" display splits into 2 halfs, like a mirror of each other and the resolution is 1200 x 800. The only way to fix it is to reboot the PC and then I get the one size screen at full resolution.
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Paul

Sorry, I have placed this in the incorrect forum....... I will close it from here and re-post it in the correct forum.
Ta
Paul

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Attachments:
Overlay_Elnik-II.vi ‏39 KB
Overlay-Init_Elnik-II.vi ‏34 KB

Joseph Loo
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Attachments:
Overlay_Elnik-II_no_init.vi ‏33 KB

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Hi lindaniss,
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http://windows.microsoft.com/en-CA/windows/which-operating-system
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Please click “Accept as Solution ” if you feel my post solved your issue.
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one specific calendar keeps changing by itself to purple. even when i change it back to the color i want, it goes directly back to purple. this happens on my ipad and when accessing icloud on my mac book

It seems that my green work calendar is now purple as well.
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This happened a while back and then reverted, if Apple would just have some notices of this at least we would know there is nothing wrong. I am getting concerned that my data is not safe !
iMac mid 2011
Mac Book Pro 17 2012
Mac Book Pro 15 2012
iphone 4s
Ipad mini
3 apple tvs
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Calendar changes colour on its own

Starting about a month ago, the calendar app on OS X kept changing my blue calendar into purple for no apparent reason.
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Display keeps changing on it's own

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