My iMac screen keeps showing pixels of previously opened documents and Safari tabs and hour or two after closing them. The shadow of those opened documents are still there hours later after shutting down and restarting my computer. What is happening

My iMac screen keeps showing pixels of previously opened documents and Safari tabs and hour or two after closing them.
Even when I swipe to the dashboard the outlines are still there when I know they should not be.
The shadow of those opened documents are still there hours later after shutting down and restarting my computer.
What is happening and what shall I do? Thanks in advance.

Not much to go on in your product info, but maybe this will help: iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program. If not, then it's time to visit an Apple repair station.
27" i7 iMac (Mid 2011) refurb, OS X Mavericks (10.9.4), ML & SL, G4 450 MP w/Leopard, 9.2.2

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Do you have Logitech gaming software installed on the PC? If so, perhaps try the suggestion from the following post:
Re: Everytime I close Itunes it loads back up

Help everytime I shut down or restart my computer my internet service goes out!!!

I have a desktop HP Pavilion Intel Core Quad
its Windows 7 and my internet service provider is Time Warner.
It is not a wireless connection.
For a few days now everytime I shut down or restart my computer my internet service goes out and I am unable to access the intenet. I get the error message "unidentified network no internet access" I do not even want to shut off my computer for fear of losing the internet access. The most recent time this has happened I called my ISP to reset my connection. I have never had to do this before so I am not sure whay is going on?
Anyone have any insight or ideas to fix this?

Your PC won't automatically choose a public network since your PC is not autonomous.
If you are using wired CAT5 connection, then your network is whatever internal adress the internet modem or router has provided. If the only thing your PC is connected to is your Time Warner router then the identified network comes from the router.
****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

Imac 27" lATE 2012 SHUTS DOWN AND RESTARTS ON IT OWN.

My imac will suddenly shut down and then restart again showing a message that it shut down because there was a fault. Has done this a few times now and wondered why.

That sounds like a Kernel Panic error. Please read Apple's Mac OS X: How to log a kernel panic located at
http://support.apple.com/kb/ht2546
and then post the complete report. From that we can sometimes get an idea of what is going on. If you run any antivirus, MacKeeper or any other third party security, anti malware or performance apps of any type that may be your issue. However let's take a look at the KP log first.

How do I clean install? I have tried the reinstall osx but still the other apps I have downloaded are still there. And also the Safari is not working anymore... I have to install Opera to have a working browser since I reinstalled the OS... please help.

Hi Please help me to understand how the clean install works...
I have purchased this ultrabook hoping I can slowly learn how to work it... I am a windows user and would like to shift to linux based machines...
My first problem is that I need to run IE explorer and media player to play wmv files on a cbt nugget iso image... It's impossible to do it since Mac does not support WMV file format... so I need to install WINE to emulate windows OS inside OS X and run windows programs... I can't install it either by following this site...
http://www.davidbaumgold.com/tutorials/wine-mac/
I can't seem to run wine after the last step, it has given me error messages.
Now I tried to uninstall it, not working either,
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I found out all the apps are still there.... is there something I missed????

What you're doing is reinstalling OS X over top of your present installation. If you want to reinstall "fresh", do this:
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Downloaded Firefox yesterday. Every time I open the Firefox browser, it starts in Safe Mode even though I have shut down and restarted my computer several times

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I downloaded the toolbar. When I was done using the computer, I put it to "sleep." The next time I "woke" the computer and went to Firefox, the toolbar was gone. When I downloaded the toolbar again, I got a box in the upper left hand corner of the screen stating Firefox BLOCKED the toolbar, and did I want to allow it. There was NO option to allow always-it's just a one time deal. When I shut down for the day, I expected it to remain, but no-next time I fired up firefox, NO TOOLBAR. I pulled up Inbox dollars again, clicked on download toolbar, got the box stating it's blocking the toolbar, etc, etc, etc. Unless Firefox upgrades daily, or in some cases, several times in one day, I'm going to stick with my description that the toolbar magically disappears EVERY TIME I OPEN
FIREFOX!!!
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Often i try open firefox but I ge a message saying it's already running to wait until it shuts down or restart my computer??

for example I've closed Firefox earlier, but when I go to re open it I get the message that it is running

This has happened to me a couple of times many months ago. I either kill the task using task manager; or I just re-boot my pc. sometimes just best to completely shut down your pc, unplug the power for a few minutes, and restart. If you're like me and leave your pc in sleep mode for days or weeks at a time, a lot build up, which may cause some programs to hand for quite a while.

TS1627 the 'quit' option in my mail account isn't working so i am unable to shut down/re start my computer. what should i do?

i cant quit mail???? and therefore i cant shut down my computor

Welcome to Apple Support Communities
Press Alt, Command and Esc keys or go to  > Force Quit, select Mail and force close it. Then, turn off your MacBook Pro.

I cannot quit iPhoto, shut down or restart my computer.

I'm reluctant to force quite because I don't want to lose any photos. Can I do this without losing data? Or is there another solution?

Actually Force quitting is dangerous and may cause library corruption and should be used as a last result - any idea why you can not quit? What strange happened? What did you just do? any other information? How long has it been impossible to quit?
Force quit may be required but best to explore first
LN

My laptop doesnt bootup it will work and then days later it shuts down and unable to start up again

has there been a recall on HP Pavilion dv6325 us entertainment
is there a problem with the video card?

There was not a recall but a warranty enhancement but it is long over. The class action against nVidia is closed now. You are on your own. There are several fine services on ebay that will fix it for around $100, but you should think of that as extending the life for maybe a year. Still $100 for a year of use is good. You might also think about a new laptop. The dv6325us is now at least 4 years old so you got a decent life out of it.
eBay example

After closing firefox, the next time I open it my homepage has gone back to the default homepage and not the one I tried to set as my home page.

I've tried multiple times to set my home page to Yahoo.com
It works as long as I have Firefox open, but if I close Firefox and then re-open it, the home page has reverted back to the default home page, not the one I set.
This has not happened before updating to 3.6.10.

There are several possible reasons for it being reset, for details see [[Preferences are not saved]].

Shut down and restart buttons don't work

About 3 weeks ago, and co-incidentally, following installing some Windows updates, I could no long shut down my computer nor activate the restart function when clicking on the shut down or restart buttons. The hibernate button does works.

While this answer did not resolve my issue it eliminated the remote possibility that mozilla products might have an effect with Windows shutting down or restarting ones computer. I've also written to Microsoft about the problem but have not yet heard back from them. Thanks for your quick reply.

Can receive mail, it takes a while. Will not send mail, tells me sending 1 of 1, but never sends. Try shutting down and restarting doesn't help. What do I do now?

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In that case your email provider's server is having difficulties to deliver the message to the recipients email provider server.
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How to I keep Firefox installed, after shutting down or restarting computer?

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== User Agent ==
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Click the Apple icon, then choose Force Quit. In the list of programs that comes up, Mail probably has Not Responding next to it. Choose it and force quit it.

MacBook Pro 2013 will not shut down without restarting.

I got a macbook pro a month ago and it will not shut down without pressing down on the power button. Using the normal Shut down options only restarts the computer. I have done all the disk utility repairs, installed new mountain lion, reset the PRAM several times, and ran software repair from doing the shutdown hold D. I also checked to see if the PRAM is good, and it is Ok in systems utilities. It will also restart when i have not touched the computer for 10 or so minutes and will go to locked user log in.
I really don't know what else to do. If you need more details let me know. Any advice?
Thanks

Thanks!
I tried this and discovered something new. I noticed that if the computer is charging while shutdown, the computer will still restart. However, if the computer is charging and you shutdown, then unplug the charger, it will remain off. It will also resume normal shut down and sleep if you shut down while unplugged, now. An idea why it will still restard while plugged in though? If not i very much appreciate your help so far!

My iMac screen keeps showing pixels of previously opened documents and Safari tabs and hour or two after closing them. The shadow of those opened documents are still there hours later after shutting down and restarting my computer. What is happening

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