27" imac flashes colored pixels and freezes

I have recently notices a stream of flashing colored pixels on my screen whenever there is significant activity.
These pixels look like asterisks, and they flash in diferent colors in diferent areas of the screen, almost like christmas lights
I have only noticed them in the last month, and my applecare expired in November!
Today the iMac froze in the middle of a download, and had to be rebooted.
The screen was covered in these flashing pixels when it froze, as you can see.

My iMac 27 inch mid 2010 is experiencing the same issue. Out of Apple Care since August. I tried using Techtool 7 to identify the problem with no results. Funny thing I noticed is that I had to un mount my hard drive manually after booting from a Protogo thumb drive. Failed to unmount automatically, said other programs were using it. The issue also appears on the Windows side when boot thru boot camp. Finally took it to a local Apple repair shop. They replaced the video card but when I got it home I still had the issue. They now have replaced the logic board and still not fixed. Apple has been working with them through out the process. Not sure what the next step is. I've had apple computers since 1978 and never ran into anything like this. All programs and the OS are current!

Similar Messages

HT203254 Without any indication of a problem my MBP-15" screen diplayed a message saying closing down and began flashing colored screens and screens with gray vertical bars.

Without any indication of a problem my MBP-15" screen diplayed a message saying closing down and began flashing colored screens and screens with gray vertical bars. I had to power foo to stop it. It has happened twice

Welcome to the Apple Support Communities
The graphic card is damaged. Take your computer to an Apple Store

IMac making loud beeps and freezes. Only way to shut down is hold power button. Any ideas what might be wrong?

iMac making loud beeps and freezes. Only way to shut down is hold power button. Any ideas what might be wrong?

iMac making loud beeps
Could be the RAM (memory)
Power On Self-Test Beep Definition - Part 2

Random error fills screen with colored pixels and then reboots, OSX 10.6.8 2010 iMac intel Core2Duo, help?

Hi all,
random error I'm guessing something to do with video drivers that replaces the screen with a bunch of colored pixels.
I'm not sure if the computer is still responding and it's just a screen issue, but I do see a little square move when I move the mouse.
I'm uploading a picture of the error.
I've updated everything to the latest version of Leopard.
2010 intel iMac
OSX 10.6.7
Any ideas?

I've updated everything to the latest version of Leopard.
2010 intel iMac
OSX 10.6.7
v10.6.7 is Snow Leopard not Leopard and there is a v10.6.8 update available.
Click your Apple menu / Software Update
Restart your Mac after the update is installed.
Same problem exists then run the Using Apple Hardware Test
Might be a bad graphics card.

New 27 iMAC keeps crashing iMovie and freezing videos on YouTube & Quicktime

We just got a new Sept 2013 iMac three days ago, purchased refurbished from the Apple Store online. The whole point of the purchase was to be able to use iMovie to thoroughly edit videos for our YouTube channel, use garage band, lots of internet surfing and video watching etc. We spent the extra dollars to get what we thought was the most improved version of the iMac with all the souped up specs in order to avoid any hassle and headaches from a lack of performance. Here's what we have:
3.4GHz quad-core Intel Core i7
27-inch (diagonal) LED-backlit display with IPS technology; 2560-by-1440 resolution
8GB (two 4GB) of 1600MHz DDR3 SDRAM
1TB hard drive (We have only used 80 GBs of it so far, so plenty of space left)
NVIDIA GeForce GTX 775M graphics processor with 2GB of GDDR5 memory
720p Camera & Mic
OS X 10.9
We're feeling a bit duped now as this seems to have turned out to just be a big expensive piece of junk. Here are our problems:
- Firstly, thank goodness that we had our own Logitech HD camera/mic left over from our PC because the "HD camera" built in to the iMac is worse in quality than my old blackberry curve. Grainy, lack luster, mic has sharp and distant sound, really really bad and false advertisement.
- In the middle of using iMovie (iMac came preinstalled with the newest one, i think its 10?), it will stop responding properly or will crash and close, we wont even have any other programs running.
- When opening Quicktime to record a new video, in the middle of a recording or while the recording window is idle, it will start glitching - flashing between live footage and a freeze frame repeatedly. The only way to stop it is to quit out Quicktime and open again and try to record quickly, or in some cases we have to completely restart the iMac, which then still randomly in the middle of a recording or idle window it will continue to flash and glitch. (You can view an example here in the last minute of one of our videos, we tried to make it work and kept the take since we were doing our outro music dance, but it totally ***** when this happens randomly during our content portion and we have to redo recording. http://youtu.be/MAJzaEShJGw?t=4m34s )
- When watching YouTube videos, the computer takes a while to respond to a command, like if we click on a certain part of the video, it will not load it until we press the pause/play button a few times and wait. Also at the beginning of a video it will start glitching and freezing again, similar to how we explained above in the quicktime, but faster.
If you are familiar with what could be the problem or have any advice, PLEASE HELP, we are concerned that after dropping so much money within just 3 days of use, this iMac is not performing flawlessly in the areas that we most needed and want to know if these issues are common and fixable or if its a defect that would require we send this thing back immediately. We did not get apple care and would hate to have wasted money that we really dont have on a glitchy crashing huge piece of junk.
Want to mention a few other pros and cons unrelated to our issues, for those who may be considering buying one too:
PROS:
- The Magic mouse is really great, particularly because of the scrolling and zooming gestures. (Though sometimes i accidentaly swipe in a browser and go back to a previous page losing any information that was input on the page i was originally on, for example, i had to retype this whole apple imac inquiry because i swiped backwards by mistake and the whole form cleared! annoying, wish the horizontal swipe navigated between tabs instead of going through the page view history.)
- When the imovie is not crashing, after watching some tutorials and making a few vids, its a really greatly improved program from the '09 version we used to use. I import and edit videos much faster now, and footage does not freeze or take time to load while im dragging and dropping, it is immediately responsive.
- Love using the Talk to text function (like Siri) by pressing "fn" twice. Use this to write long emails and papers with ease. Would like to see a "Speak" read back option that allows for text to be selected and read back (like Siri on iPad)
CONS:
- The text is SO small everywhere and there is no option to exactly set text size across the whole system, only option given is to set a different resolution which lessens the quality of the screen with pixelation, and some programs give you the option to set custom sized text in their individual preferences.
- Sometimes in both iMovie & Garageband, simple automated functionality will stop working, for example in iMove, when certain screens or images are dragged and dropped to the work area by the activity bar (i dont know what else to call it, the line that rolls across during playback or stays put when pressing spacebar) usually, that screen or image will click into place to align with the activity bar and will highlight the bar yellow to further communicate that alignment before you drop it, but after extended use in a session, that snapping into alignment when adding items stops working. Or sometimes you can drag and drop the ends of a title screen to adjust/trim the clip, but after extended time that too stops responding and does not let the cursor turn into that arrow that allows you to trim or extend, until after many frustrated clicks or a quit and restart.
- When sharing/exporting a video from iMovie, i would recommend unchecking the add to theatre option because it significantly extends the amount of time needed to complete the action and i found out the theatre is just like a video stream of your movies to be shared on icloud for easy access from your other devices (similar to the icloud photostream connected to iPhoto). It takes the time to make the video readily availabe in various sizes on the Mac server for easy access, which means it takes forever for your video to be exported to where you actually want it. This is not something we need and is not worth the wait time. (For example, last ime we left the theatre box checked, the progress status of the video was estimated to be completed in 351 minutes, and then 20 minutes later that somehow inclreased to 385 minutes, then duddenly it was done, so i think this add to theatre option also cause the progress status updates to go berzerk.)

Given the maximum RAM that model can use is 32GB, and the earlier release of that 27" mid-2013 iMac is nearly the same in most regards, you may note the listing of this slightly older iMac 27" is here in an Apple support document...
•iMac: How to remove or install memory:
http://support.apple.com/kb/HT1423
http://support.apple.com/kb/HT1423#1
The images of where the RAM chips are located, behind a metal plate, should be similar in your iMac and the mid-2013 iMac 27" shown in images on that page. Note there are several models discussed.
You could take the computer to a certified Apple service facility (retail store, or specialist reseller) and pay them to do this, and buy the RAM from them, and you will pay for this at a retail level. If they do it, you'd want to be assured the computer did all the things you sought to cure by upgrading RAM, correctly without fault. Like run tests and stuff.... Or there's no reason to not go ahead (after confirming from Apple) that you could buy quality RAM and do this job yourself, citing the Apple page link I'd posted above.
Contact Apple Support:
http://www.apple.com/support/contact/
You'd have to obtain the correct RAM (as indicated in my earlier post, citing MacTracker) of suitable quality for use in a Macintosh computer, and the recommendation for a DIY is to get the kit from 'Other World Computing' OWC online at their site. You can talk to knowledgable sales staff at OWC about what you have and what you need, and to help they may ask for the product serial number.
This is OWC and they have the spec RAM required for your iMac 27" model; double-check info:
http://eshop.macsales.com/shop/memory/iMac/2012_27/DDR3L
Since yours is an Apple Refurbished model it will have a different number series. Unlike those in a retail store, because Apple does that to tell what ones they refurbished; refurbs I bought online were like that.
With questions during the first three months, you can get 'support' under the initial 90-day span of ownership of the new (and certified) Apple refurbs bought online; the other part of that is 'service' for 1 year. Call a nearest retail Apple Store, to set a genius appointment; or go online, and start the process of reporting your issue, while you still have some kind of warranty on the device. They can diagnose the issues you cite and tell you if you can upgrade the RAM (as you likely can) then you can buy and install the RAM yourself and probably pay less than 1/2 the retail rate, if you get some from OWC. A diagnosis is free if the Genius looks into it, but you'd need to set an appointment & lug the iMac to their store; protected from weather/shock.
If you want to extend the complementary service to three years (less the included 90-days) and add two years of AppleCare service, that is an affordable option of about $170. For a total of three years coverage.
{If you had a 21.5-inch iMac the RAM would require a service department visit where they use a different method to install the RAM upgrade. Those are built differently than the 27-inch iMac.}
There is a bit of detailed important information in the Apple link on how to upgrade the iMac RAM. There is a certain amount of RAM installed already and these chips would likely be removed if you get matching sets of new RAM to upgrade the capacity. And no matter what some say, there is a reason why they can be upgraded with more. Even with Mavericks OS X 10.9.x and its 'memory compression' etc, it would gladly accept all the RAM upgrade chips it could swallow. (Behind metal screen, mid-bottom iMac 27")
You may need to consider questions about applications that use system resources separate from those about whatever issues your iMac seems to exhibit. There may be some other cause of the video and iMovie symptoms, but more RAM won't hurt given the beast you bought can use 32GB and it has 8.
And if it seems too much to handle, you have 14 days from date of
purchase to take it back. Contact them ahead of then, if you do.
Hopefully this helps.
Good luck & happy computing!

Help. iMac flashing question mark, and now power loss at startup.

Hey. I've had some really weird issues with my iMac. It's a 2.8 core 2 extreme aluminium 2007 iMac. It was bought for me at the end of august 2007.
What happened was, I was watching a movie and it started freezing. Everything was so slow. So I turned it off by the mains since it wouldn't shut down. When I tried booting it back up it had the flashing question mark. So I read up on it and tried doing what the apple support website recommended, which was to put the install disc back in and use the disk utility to repair the disk. Except this wouldn't work and it said the hard disk could not be unmounted. So I read up again and apple recommended resetting the PRAM, which I did and then it wouldn't recognise the hard drive AT ALL. But after a few tries of booting up it found it again, I got on disk utility and still said the same thing when I tried to repair. So I repaired the permissions instead and restarted and the computer booted as normal. But then was still very slow and freezing. So I opened disk utility one more time and tried repairing permission, restarted the computer and now when it gets to the apple logo and the loading icon it looses power and goes blank. I've already tried resetting the SMU. it didn't work. Has anybody got ANY clue to what I can do? Is my waranty up? I don't have AppleCare. Any help would be appreciated. Thanks.

If you have an Intel iMac, it has an SMC not an SMU, so if you used the procedure that says "SMU" on it, you used the one for an iMac G5, which is not an Intel iMac.
Since you did many different things in a somewhat random order, you may want to do the following, even if you did some of it already.
Reset PRAM
http://support.apple.com/kb/HT1379
If that does not help, reset SMC
http://support.apple.com/kb/HT1543
which is basically disconnecting ALL cables and power, then reconnecting using a precise procedure. If you have been connecting the power cord to a crowded or old power strip (surge suppressor), try connecting it directly to the wall outlet, at least initially. First, power it up with nothing connected, except for power cord. If that works, add just your keyboard/mouse and use it that way for a while to evaluate how the iMac is working. If all is well, connect your other peripheral (USB/FireWire) devices one by one. If the problem does recur at some point, identify the device added last; it may be faulty or causing some kind of interference.
If the problem remain, even when trying to start up the iMac with nothing but power cord connected, connect just your keyboard/mouse. Insert your Mac OS X installation disc (for the currently installed system) and restart with the C key held down. Sounds like you did this already. You should note if the iMac is running normally when booted off the installation disc. If so, the problem may be your internal drive; it may be faulty. Run Disk Utility from Installer's menu bar, and try to do a +Repair Disk+ again. See if it works any better this time.
You can also try using the Apple Hardware Test, including on your original disc(s)
http://support.apple.com/kb/HT1509

Flash stops working and freezes firefox. I have Fast dial and dont want to lose it so what can I do to fix this?

It doesnt matter what site or what I am doing it will come up randomly and freeze firefox then finally a box pops up and says Flash is busy or not responding continue or stop plugin. Naturally I stop plugin. I always install the latest flash versions I have even uninstall and reinstalled flash and downgraded and still no change or it bugs me to update. I am using firefox 26.0 I usually stay away from the betas if all possible. My biggest worry with using the reset firefox or making a new profile is my fast dial I have tons of sites right there waiting for me to click on and im afraid if I do all this I will lose it. But I have used same profile for years and years so maybe its time. I will just have to redo my fast dial I guess Unless someone can come up with another way to do it. I have disabled hardware acceleration on firefox I have to it makes my browser do some weird things. I also have disabled Hardware acceleration in flash as well. I have cleant temp files and registry. I am good with computers but have never seen issues like this with flash. If anyone could help that would be great. Thanks.

Sounds like you have done a lot. Have you tried to make a new profile for TESTING purposes only? You could have a bad profile. it is possible.
Also, have you tried protect mode for flash? I wrote up a bat file to set it up so you don't have to go digging through system files.
Also i have some unorthodox methods you will not see in these forums to try out if you are interested as they have resolved several peoples that i can confirm issue. I have been going crash free for over 6 months now since i implemented. Believe me some issues nothing in these forums will resolve. Click on my name on the left there is a blog i created just for this issue with all the info and some of the fixes. Everything is fully automated. Very little user interaction.
This will NOT work for everyone, but you cant hurt by trying
Best regards

Ipod touch has flashing colored screen and will not turn off

I have tried to plug the ipod into the computer and to reset it but it is frozen on a flashing colored screen.Any help would be appreciated.Thank-you

Let the battery fully drain. After charging for an hour, try the reset and connect to computer and try to restore.

IMac gives three beeps and freezes

My neighbour's iMac starts and runs normally most of the time, but periodically when running emits three beeps and then freezes. This is NOT the usual "three beeps at startup" indicating a RAM problem, but whilst the machine is is actually being used.
Can't seem to find anything about this anywhere. Any ideas, anyone?
(The logic board was replaced very soon after purchase as the machine had all sorts of problems . . .)

My imac mid 2010 worked fine with "new" memory for 6 months, then started hanging in mid-session - meaning it froze and beeped loudly hours or days after it booted OK. Put old memory back in and noticed it ran more smoothly with less memory than more. Put the "new" memory back in and ran memtest for days and days; no problems reported. But, the system still froze after I'd been working for a while - at odd times. So, took the "new" memory back to the store, and, while there, upgraded to (more expensive) Crucial brand memory - just to be on the "safer" side. Put the replacement memory in and my imac has never run better - not even when new. So far, my imac is quieter, cooler, and smoother now than since the day I bought it. Thought I'd post this on this old thread because Apple Care had told me to bring the machine to them for three days of testing - per other posts I'd seen on the net. But, that would have been a complete waste of time - since they'd wind up (with the old memory) telling me "no problem," or, (with the "new" memory,) "it's a non-apple part problem." Meanwhile, bad memory can mean bad writes to your hard drive; mine seems fine, but I generally pay close attention to problems and fix them asap, or, sooner. If you wait until you have additional problems, you may spend a lot more time and money getting things finally done - and you may wind up back at "square one" or worse if you trash your drive and it's contents.

IMac has become slow and freezes up

For a few months now my iMac has been much slower than it used to be. Apps take longer to open, menu functions respond more slowly, folders and files take longer to open, pages longer to display, etc. Frequently the active window freezes and the colour wheel starts spinning for 10-15 seconds (it has been doing it twice since I started writing this sentence). This happens with all apps I am using, like Safari, Mail, Word and Excel, but particularly frequently in Logic Pro X. Sometimes when it happens (but not always), I get the error message "Disk too slow or system overload (-10010)". However, I upgraded to Logic Pro X about a year ago, and I never had this problem during the first number of months after the upgrade. I am aware that Logic uses a lot of CPU and memory, but, as mentioned, I also have the problem when Logic is not running. This leads me to think there might be something with the hard disk, although it beats me why it suddenly should have become slow. I am currently running everything from the built-in 1 TB hard disk. I have a 3.1 GHz Intel Core i5 CPU and 8 GB RAM. A full EtreCheck report with my system specifics is enclosed below. Can anyone help?
EtreCheck version: 2.0.3 (88)
Report generated 13. oktober 2014 20:02:21 CEST
Hardware Information: ℹ️
iMac (27-inch, Mid 2011) (Verified)
iMac - model: iMac12,2
1 3.1 GHz Intel Core i5 CPU: 4-core
8 GB RAM Upgradeable
BANK 0/DIMM0
4 GB DDR3 1333 MHz ok
BANK 1/DIMM0
4 GB DDR3 1333 MHz ok
BANK 0/DIMM1
empty empty empty empty
BANK 1/DIMM1
empty empty empty empty
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
AMD Radeon HD 6970M - VRAM: 1024 MB
iMac 2560 x 1440
System Software: ℹ️
OS X 10.9.5 (13F34) - Uptime: 3 days 11:48:59
Disk Information: ℹ️
ST31000528AS disk0 : (1 TB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / [Startup]: 999.35 GB (511.48 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
HL-DT-STDVDRW GA32N
SAMSUNG MZ7TE512HMHP-00000 disk1 : (512,11 GB)
S.M.A.R.T. Status: Verified
LaCie (disk1s1) /Volumes/LaCie : 409.69 GB (409.15 GB free)
LACIE SHARE (disk1s2) <not mounted> : 102.42 GB
USB Information: ℹ️
Line 6 GX
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. FaceTime HD Camera (Built-in)
Apple Computer, Inc. IR Receiver
Apple Internal Memory Card Reader
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
LaCie Rugged THB USB3
Gatekeeper: ℹ️
Mac App Store and identified developers
Kernel Extensions: ℹ️
/Library/Extensions
[loaded] com.line6.driver.xtaudio (7.3.6 - SDK 10.7) Support
/System/Library/Extensions
[not loaded] com.cisco.cscotun (1.0) Support
[not loaded] com.olympus.CamBlockCommandsDeviceUP (3.1.0 - SDK 10.6) Support
[not loaded] jp.co.yamaha.driver.YamahaSteinbergUSBAudio (1.6.0f1 - SDK 10.6) Support
Launch Agents: ℹ️
[invalid?] com.cisco.anyconnect.gui.plist Support
[loaded] com.divx.dms.agent.plist Support
[loaded] com.divx.update.agent.plist Support
[loaded] com.oracle.java.Java-Updater.plist Support
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist Support
[running] com.cisco.anyconnect.vpnagentd.plist Support
[running] com.line6.l6ksettingmgr.plist Support
[loaded] com.microsoft.office.licensing.helper.plist Support
[loaded] com.oracle.java.Helper-Tool.plist Support
User Launch Agents: ℹ️
[loaded] com.adobe.ARM.[...].plist Support
User Login Items: ℹ️
AirPort-basestasjonsagent Program (/System/Library/CoreServices/AirPort Base Station Agent.app)
witchdaemon Program (/Users/[redacted]/Library/PreferencePanes/Witch.prefPane/Contents/Resources/wi tchdaemon.app)
iTunesHelper ProgramHidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Dropbox Program (/Applications/Dropbox.app)
DVDAuthorizeHelper Program (/Users/[redacted]/Library/Application Support/Helper/DVDAuthorizeHelper.app)
Internet Plug-ins: ℹ️
FlashPlayer-10.6: Version: 15.0.0.152 - SDK 10.6 Support
DivX Web Player: Version: 3.2.3.1164 - SDK 10.6 Support
AdobePDFViewerNPAPI: Version: 10.1.12 Support
AdobePDFViewer: Version: 10.1.12 Support
Flash Player: Version: 15.0.0.152 - SDK 10.6 Support
Default Browser: Version: 537 - SDK 10.9
OVSHelper: Version: 1.1 Support
QuickTime Plugin: Version: 7.7.3
GarminGpsControl: Version: 4.0.4.0 Release - SDK 10.6 Support
SharePointBrowserPlugin: Version: 14.3.4 - SDK 10.6 Support
JavaAppletPlugin: Version: Java 7 Update 67 Check version
Audio Plug-ins: ℹ️
DVCPROHDAudio: Version: 1.3.2
3rd Party Preference Panes: ℹ️
Flash Player Support
Java Support
Line6AudioMIDI Support
Perian Support
Witch Support
Yamaha Steinberg USB Support
Time Machine: ℹ️
Mobile backups: OFF
Auto backup: YES
Volumes being backed up:
Macintosh HD: Disk size: 999.35 GB Disk used: 487.87 GB
Destinations:
Data [Network]
Total size: 2 TB
Total number of backups: 110
Oldest backup: 2013-05-13 07:48:39 +0000
Last backup: 2014-10-13 17:31:26 +0000
Size of backup disk: Adequate
Backup size 2 TB > (Disk used 487.87 GB X 3)
Top Processes by CPU: ℹ️
      47% Logic Pro X
      5% WindowServer
      3% com.apple.WebKit.Plugin.64
      0% sysmond
      0% coreaudiod
Top Processes by Memory: ℹ️
1.08 GB Logic Pro X
292 MB Safari
266 MB Finder
249 MB com.apple.WebKit.WebContent
198 MB com.apple.IconServicesAgent
Virtual Memory Information: ℹ️
33 MB Free RAM
3.67 GB Active RAM
3.68 GB Inactive RAM
1.19 GB Wired RAM
3.97 GB Page-ins
4 MB Page-outs

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.
The title of the Console window should be All Messages. If it isn't, select
          SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar at the top of the screen. Click the Clear Display icon in the toolbar. Then take one of the actions that you're having trouble with. Select any messages that appear in the Console window. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of which is irrelevant to solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Some private information, such as your name, may appear in the log. Anonymize before posting.

Imac monitor is pixelating and getting fuzzy...

Hi fellow mac-heads,
My Mother's intel imac 7,1dual intel core, is about 4 years old. The monitor just started pixelating, getting fuzzy and displaying black stripes both vertically and horizontally. My first thought, from experience, (my g5 has went through 3 video cards!) was that she needs a card, becaus eit seems to do it when it heats up a bit and dragginthe mouse across the screen reverses the effect temporarily. Now, i popped this thing open myself 2 years a go and replaced the hard drive and I don't remember if it has a video card. "about this mac" states that it has an ATI Radeon hd 2600 video card, but a lot of dicession boards say that the video card is intergrated into the motherboard. Can anyone tell me, before i hae to crack it open or lug it into the genius bar?
thnx in advance.
-palmer

Your system cannot find the startup volume. Please carefully read Flashing question mark appears when you start your Mac , Apple provides the trouble shooting steps in the article. As a general rule of thumb NEVER EVER shut down the system by unplugging it, you have the ability to Force Quit applications. You can find Force Quit under the Apple symbol in the upper left corner of your screen. Also use Activity Monitor and check to see if you have any run away processes and how much FREE RAM your system has.

IMac won't sleep and freezes on shutdown

My iMac has developed an annoying problem. Most nights, when I try to put the computer to sleep, it goes to sleep and the immediately wakes back up. I exit all programs running in the dock and try to sleep it again, but the same thing happens. I will then try to shut it down, but it freezes on the screen that shows the wheel with the lines (sorry for the bad description there). Any ideas?

Here's more on sleep;
This is for a Mac that won't sleep.
Here is KB article HT1776 with their tips.
Mine follow;
USB devices and hubs often cause Macs to not sleep or wake quickly from sleep (notably HP printers and scanners, HP all in ones, and Cannon scanners). Disconnect all USB except for keyboard and mouse and try. If it sleeps, add one back at a time testing after each one to find the culprit.
If you've set your Mac to receive faxes, it may not be able to sleep. It might also have a damaged preferences file.
If you use your Mac for faxing, open System Preferences. click Print & Fax, click the Faxing tab, and uncheck the Receive Faxes On This Computer box.
If that doesn't work or you've never faxed on your Mac, go to Finder/Hard Drive /Library/Preferences/SystemConfiguration and delete the com.apple.PowerManagement.plist and com..apple.AutoWake.plist files (if your Mac asks, type your admin. password).
If the latter file isn't present in the folder, go to user name(probably your name)/Library/Preferences, delete the com.apple.systemuiserver.plist file, and reboot your Mac.
Hope this helps!
P.S. One member here reported this (Michael Gleason);
"I have had this problem with my IMac G5. It is surprisingly irritating. LaCie's Silverkeeper backup software was the cause. By default it gave itself permission to wake up the computer to check if a backup was needed. Do you have this or a similar program installed which has scheduled activities including wake-up permissions as an option?"
Dave Hamilton provided this link, xlr8yourmac.com, to a member, which addresses failure of deep sleep with some users that updated and added new FireWire and USB card.
Also, here is Apple KB article TA2469 about PCI cards and sleep.
tomhorvat adds this; After few days of messing around I found out that I had desktop background (wallpaper) set to change every 1 minute.
After unchecking "Change picture..." in system preferences (under Desktop/Screen saver), my powerbook went to sleep all by itself.
Tristan Currier noticed this; "I have a Canon printer(shared) and my imac would not sleep. I opened up printer/fax in system prefs and noticed it said the printer was in use when it was off. Opened up the printer queue and noticed about 7 pending documents. Deleted them all and now it sleeps.
Check the printer queue!"
Good Luck!  DALE

NEF to DNG 6.5 results in different number of unique colors, pixels and RGB values

I took pictures from my old Nikon D40. I converted them with the standard settings from NEF to DNG.
I then used UFRAW under Linux and saw that the pixel size increased from 3039x2040 in NEF to 3040x2040 in the DNG - and that the live view RGB values were about 5% higher for NEF that for DNG.
"FastStone Image Viewer" shows the same increase in pixel size. Additionally, it shows that the DNG has roughly 93,000 unique colors compare to 90,000 for the NEF file.
More pixel, different RGB values, different counted unique colors - what's going on here? This doesn't look like a 1:1 conversion?

Not exactly sure what you're comparing. For raw data you need to be comparing the original mosaic data values (not some converted result, or even partially converted result like demosaiced result). Are you sure that's what you're doing?

2009 Imac i7 Screen glitchy and freezing (see picture)

My 2009 27" iMac just recently started doing this:
It sometimes is unresponsive, and sometimes the display will start to glitch in this way, but certain functions are still responsive. For example sometimes I can restart the computer through the apple menu, sometimes I can save a file before restarting. Other times the cursor freezes as well and nothing responds. So far restarting the computer has fixed it everytime. It started about two days ago and it's happened about six times. Any thoughts about what this might be? Has anyone seen this before? Any ideas how to check what it is?

Is there a risk of further damage if I delay taking it in? I mean I'll want to get it fixed soon because I want it working properly, but do I need to stop using it in the meantime, or take it in tomorrow or something? Or just as soon as I get a chance in the next few weeks would be fine?

Flashing Red Screen and freezing

I am needing help please. I have bought a macbook pro (Last Nov. 2009) version 10.6. with a 2.53 GHz Intel Core 2 Duo and I have 4 GB memory. I have been taking advantage of the macupdate software packages and I am not sure if new software is causing my problem. My computer has frozen lately when doing a few tasks at once. Most often when working with picture software. The most disturbing is when my computer goes to the screen saver which was one of the software products I purchased: My Living Desktop Scenes, the screen begins to flash red and only stops when I touch a key or other to take it out of the screen saver. I have had the living desktop software installed for weeks now and I have only had this problem start recently. The last package of software I bought was the Mac Graphoto 2 applications (Image framer, Sandvox, snapshot, sketch, layers, postern etc...). I have really only used image framer and postern so far. The problems seem to have begun after downloading some of this software. What should I do? I have five days before my 1 year warranty runs out. Do these software bundles cause more problems than they are worth or maybe have nothing to do with my problem?? Any help is appreciated.
P.s My computer also seemed to be slowing down whether working with applications or being on the internet, so I followed another threads suggestion on shutting the computer down and holding the power button for five seconds and then shutting down and holding the control, P and R buttons and this seems to have helped speed but not the flashing or freezing. Hope this is enough detail.

I have a Mac Mini (2.66 GHz Intel Core 2 Duo with 4GB 1067 MHz DDR3 memory) and I am also having the same issues with the red screen. No Living desktop on my desktop...just a solid red - sometimes flashing red screen....no sound at all....when I move the mouse to unlock the screen - the sound comes back briefly and the login window appears.
Any resolutions to this problem? Thanks in advance.

27" imac flashes colored pixels and freezes

Similar Messages

Maybe you are looking for