Hello, My Imac is freezing during startup.

It chimes and bigins loading. The spinning circle freezes after a few moments. It is able to boot in safe mode. Using command v during startup this is the last line displayed "GFX8: family specific matching fails". Also, this Imac has the infamous overheating graphics card problem.

Have you attempted Disk Repair in Utilities? Are you still using 10.5.8 as your profile suggests?
As old as your iMac is, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosend. Reinstall the RAM grille. Plug in the keyboard and mouse if not blue tooth. Insert power cord...
You are now in a perfect position to do a
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
It is the 5 second timing that initiates the reset.
Here is a link to a Widget to monitor your temps and other operations:
http://islayer.com/apps/istatpro/

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Imac freezes during startup stops @ blue screen & have tried everything

My imac freezes during startup, it gets to blue screen and just sits. I have tried to boot from the Leopard 10.5 install disk, and just sits, can't get to log in screen. Have run the disk utility and it says disk appears to be ok, Won't startup up in safe boot, blue screen just sit. Have tried 'fsck' fix, just sits at blue screen. Have reset PRAM, I don't know want else to try. Disk utility & "fsck" says 'disk appears to be ok'. When exiting fsck, it will start the process then stops. Does anyone have any suggestions, I have not tried to reinstall 10.5 yet.
Thanks in advance
Paula

After reading resolutions TS1541 & other threads, I decided to try to archive & reinstall 10.5 from install disc. Well that made things worse, sometime during reinstall, system locked up, I looked at the log during install & it had been locked up about 3 hours and now I have nothing. no systems files, using Target( firewire cable) disc with my macbook, I can see I have previous system folder & a folder that say system. but Install disc does not see OS.
Do I need to take it to an apple store for repair or what. It's only 3 years old.
please help
Paula

Freeze during startup after SW update from 10.4 - 10.4.8

After updating to 10.4.8, my machine would freeze during startup (at the gray screen with the apple and spinner) and give me the "Please restart your computer" message in a few languages.
I thought it might be a RAM issue, so I removed all third party RAM - same problem.
I replaced all of the RAM with RAM from another G5 that I know worked - same problem
I moved the HD from my G5 to another G5 that was working - same problem (I believe that eliminates the motherboard and any other components from being the problem).
I thought that the HD might be bad, so I replaced it with a brand new SATA drive, installed 10.4 and it worked perfectly, ran all of the SW updates (including the combined 10.4.8 update) and I get the same freezing again when I reboot.
Any suggestions are appriciated!

Hi Joe,
Welcome to the only place where you can get friendly advice.
Ok have you tried starting up from the installer / restore CD that came with the mac and run disk utility??
Try hardware test doing the extended test in a loop to try and find the base of the Kernel panic (thats what the "you need to restart your computer" image indicates)
For info and guidance on Kernel panics see:
http://docs.info.apple.com/article.html?artnum=106227
and trouble shooting info:
http://docs.info.apple.com/article.html?artnum=25392
for extensive advice on solving the kernel panics see:
http://www.thexlab.com/faqs/kernelpanics.html
Worst case senario it could be the G5 processors, make sure you have applecare; just in case it gets expensive!!

Computer freezes during startup

My Mac book pro. Freezes during startup. Spinning wheel goes for about 15 seconds, then just stops. Any ideas?

Ok, I tried that and it didn't help, but thanks for the suggestion anyway because device drivers are always a pain in this.
Then I started looking for log file changes because I suspected that something (related) ought to be logged about this nagging bug. The witch hunt directed me towards the google updater agent -- whatever -- that got stuck on bringing chrome to the latest level.
I read all sort of incompatibilities between google chrome and macbooks, this could be another one. I downloaded the latest version of chrome manually, overwrote the existing implementation of chrome and the freeze-up seemed to vanish.
Not so nice this all.

Freeze during startup

During startup, the system freezes (no cursor, no keys).
It boots as far as the "Log On to Windows" screen. The cursor still moves, and then it stops after perhaps 30 seconds
(keys non-functional too),
Tried the rescue and recovery but when it gets to Step 1 with choices including "Restore my gard drive to the original factory state" everything freezes again.
Prior to this problem the system would hang during shutdown.
How do I get past this point?
(T43 with XP sp3)

Welcome to the forum!
Sounds like a failing SouthBridge chip to me.
Try removing the hard drive and booting from a "live" Linux CD.
If you experience the same type of freezing there, you're likely looking at a motherboard swap.
Good luck.
Cheers,
George
In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

My iMac keeps freezing on startup

For about two weeks my iMac which I only bought in October of last year keeps freezing on startup after I sign in. I have tried the cmd-alt-p-r about 4 times. It works for about two days and then starts freezing again. I need assistance please.

Go step by step and test.
Startup in Safe Mode
http://support.apple.com/kb/PH14204?viewlocale=en_US
Repair Disk.
Steps 1 through 7
http://support.apple.com/kb/PH5836
Startup Manager to select Startup disk.
http://support.apple.com/kb/HT1310
Reinstall OS X
http://support.apple.com/kb/PH13871

IMac is freezing during start-up from OS X installation disk

My iMac 27" is freezing during re-installation of the complete machine from Leopard OS X installation disk. The machine ends up (also in safe mode) with a screen showing something like "horse steps in the snow" as shown in both pictures, which can be seen on:
http://whbakker.demon.nl/screen and http://whbakker.demon.nl/detail
I cannot find a thread or a good suggestion, what to do to re-initialize the complete machine.
Thank you in advance for your answers!
Willem.

willemhb wrote:
My iMac 27" is freezing during re-installation of the complete machine from Leopard OS X installation disk.
Can we assume you mean your Snow Leopard installation disc & that it is a grey one that came with this iMac?
27" iMacs are new enough that they can't run Leopard (OS 10.5), nor can they run some of the earlier versions of Snow Leopard. The installer on the disc should check for this & refuse to attempt an install if it is the wrong one, but if you are trying to boot from the disc to start the install it will never get that far. This is because the earlier OS versions lack the necessary extensions to support the latest hardware in the iMac. Thus, a safe boot won't help since there is still no source for them.
Also, if you have installed any aftermarket memory modules, it is possible they are not fully up to spec & incapable of running Snow Leopard. You may be able to verify this by starting up from the Apple Hardware Test, which you run from the original grey system disc by following the instructions printed on it. If you get an error with "MEM" in it, it means one or more memory modules is defective. If they are aftermarket ones, contact the supplier for replacements. If they are Apple-supplied modules they are covered by a one year Apple warranty (or 3 year one if you bought the Applecare protection plan).

My iMac 24" freezes on startup and then works

Hi! My iMac has a startup problem: It freezes on startup around 5-10min and then works again. Sometime the desktop is loaded and sometime it only shows the blue screen. I can move the mouse cursor but the click doesn't work. I backup files with the time machine and reinstall the OS but the problem still exists. I run AHT (extend) and the result is OK, no Hardware problem. Anyone knows how to solve this problem? Thanks in advance. TW

More issues since I last posted:
It's running, very poorly, but am trying to upload an MP3 to soundcloud.com and the upload keeps freezing. It's nothing to do with my Internet connection either.
Quite honestly I think my iMac is on its last legs
I really need this running as smoothly as quickly as possible as my partner has recently been made redundant and needs the mac so she can look for jobs. This is very inconvenient :/

Freeze during startup if magic trackpad not available

Down in SF last week and bought a magic trackpad and installed it. worked fine.
Got home and turned on my MBP; it froze during startup with only the finder window open, no dock, and not much else. mouse pointer couldn't click on things, etc. I tried restarting and restarting into my test (bare bones) account. No luck.
Then I wondered if the problem was that my new magic trackpad was there and turned on. That was the problem. As soon as I got the trackpad and turned it on, my system completed normal startup.
Anyone else have this experience. This seems like a bug.

Today I tried to replicate my problem and couldn't. Either by turning off the trackpad before I shut down or else while my computer was off.
So apparently my incident was an isolated one.

IMac freezing during startup

So I was working on my iMac the other day and all of a sudden the screen went blank (grey screen). Turned it off using the power button and restarted it. I get the chime and the apple logo coming up with the scrolling wheel below but then the screen goes blank and I can't get any further than that.
Have tried booting up in safe mode (Shift), verbose (Cmd+V), starting in Recovery System (Cmd+R), Single User Mode (Cmd+S) and resetting the NVRAM/PRAM (Option + Cmd + P + R). Nothing has worked. Always get to the apple logo and scrolling wheel only to freeze on a gray screen after that.
Can't find my Install Disc but have tracked one down that I'm going to try tomorrow.
Besides the Install Disc does anyone have any suggestions that could help me out? Only have a portion of my HD backed up (stupid I know) so really hoping this issue is solveable and that I can salvage what I have on that computer.
Thanks!!

Try booting while holding down the Option key.
Theoretically that should launch the Startup Manager window where you can select the startup disk then click Restart.
The original install disc cannot repair the startup disk on a Mac running v10.7 Lion. Only OS X Recovery

IMac freezes during startup

Hey all, my iMac has been at my house alone for 3-4 months while I was away. It was working perfectly fine before I left. When I returned home recently and tried to start it up it took much longer to get to the sign in screen then usual. When I logged in to my account it would show my desktop wallpaper but nothing else. The screen would flash now and then random bits of things and that's all. I could move the mouse on a blank flashing desktop.
Everything I had on the HDD was already copied over to a backup before I left, so I decided I was just going to try and reinstall the OSX and see if that would do anything. When I try to boot from the CD it just gets to the apple logo screen with the loading symbol beneath it and will stay like that for pretty much forever.
Can anyone help me out with this? Thanks a lot ^_^

See KB 106464, Your Mac won't start up in Mac OS X.

Cannot boot iMac G5. Freezes on startup.

Hi! I'm having a huge problem with my iMac G5 powerPC.
I've bought it secondhand about two years ago. Upon checking the serial code I found out my computer was produced mid- 2005. The previous owner installed a newer OS X version, which I assume was Leopard.
About a week ago my computer started shutting down at random. After startup it would work for about 5 - 15 minutes before losing power again. It wouldn't feel hot and I could power it up again right away.
This went on for about two days, and now I'm completely stuck. When I press the powerbutton now, it usually freezes at the white Apple logo with the spinning gear underneath it. Unlike the many posts I've read about this, my spinning gear doesn't freeze, but just keeps on spinning forever... The longest I've let it sit like that is for about an hour. However, sometimes it passes this stage and freezes on a blue screen with the cursor in the left top-corner.
I've started it in single-user mode and used fsck. It made a lot of noise and displayed "***** FILE SYSTEM WAS MODIFIED *****", but right after that it shuts down again... I've tried this three times now.
Resetting NVRAM / PRAM didn't fix it. Resetting open firmware didn't fix it.
It won't start in safe mode either.
I doubt it's the powersupply, since it can run for hours if I don't touch it, and I've tried multiple outlets.
I've heard of reinstalling OS X while keeping my data, but I suppose that's impossible for me for I didn't get an install disk when I bought it.
I'm at loss! Does anyone have any suggestions or ideas?
Thanks in advance!
Lillian

I've started it in single-user mode and used fsck. It made a lot of noise and displayed "***** FILE SYSTEM WAS MODIFIED *****", but right after that it shuts down again... I've tried this three times now.
Could be a bad harddrive. Replaceable. or get an external drive.
There have been a lot of hardware problem with early iMag G5's. Capacitor problems. Power supply.
You may be able to get a restore cd from apple. ask for leopard.
10.4 & 10.5 available from Apple by calling 800-767-2775 on January 20, 2013.
https://discussions.apple.com/thread/4720126?tstart=0
I'd start by getting a dvd from apple.
You need an external Firewire drive to boot a PowerPC Mac computer.
I recommend you do a google search on any external harddrive you are looking at.
I bought a low cost external drive enclosure. When I started having trouble with it, I did a google search and found a lot of complaints about the drive enclosure. I ended up buying a new drive enclosure. On my second go around, I decided to buy a drive enclosure with a good history of working with Macs. The chip set seems to be the key ingredient. The Oxford line of chips seems to be good. I got the Oxford 911.
Has everything interface:
FireWire 800/400 + USB2, + eSATA 'Quad Interface'
save a little money interface:
FireWire 400 + USB 2.0
This web page lists both external harddrive types. You may need to scroll to the right to see both.
http://eshop.macsales.com/shop/firewire/1394/USB/EliteAL/eSATA_FW800_FW400_USB

Macbook pro freezes during startup after Yosemite

hello, i have a Macbook Pro (Retina, 15in, early 2013). I have since used it and never had any problems. i am also running the latest version of parallels (which i just updated before downloading & installing the update from Mavericks to Yosemite. Since installing Yosemite, i was able to use my macbook for about a day...suddenly during a login attempt i kept gettting the spinning wheel & the computer would just freeze.. ive been reading this comments & questions for the last 3 days & tried as much as i am capable of. I can not get the computer to boot in safe mode... i CAN boot it holding commandR...but than at that point i ran disc utility and it said no errors... I am utterly lost....this macbook doesnt come with a built in CD/DVD drive and i have NO CLUE how to properly back up anything...i DO NOT KNOW WHAT TO DO...can someone PLEASE help me using as much LAYMANS terms as possible? I truly appreciate ANY HELP!!! thank you in advance

... and i have no idea what else to do :?
Return that RAM and buy either the Crucial ram (http://www.crucial.com) for your system or buy from OWC (http://www.macsales.com). I've used Cruical ram in many systems over the years with no issues, and have bought Samsung (factory fill) from OWC with no issues either.

24" Imac shuts down during startup, HD replaced

So my iMac (running Mavericks) was running really slow and wouldn't respond often. It got to the point where it was freezing up or getting the spinning wheel all the time. I assume the HD was failing and bought a new one. I originally had a WD SATA 1TB drive in it (original from apple) So I basically ordered the same thing from Amazon. A WD SATA 1TB. I followed all instructions on iFixit for HD replacement. Overall the installation went fine. Not my first time under the hood of one of my Macs. I ran the recovery mode, formatted the new drive and restored from the time machine backup. All going smoothly. Now when it boots I get the gray screen, apple logo, spinning gear then complete shut down. Zapped PRAM, rest SMC. I'm at a total loss what to do next. PLEASE HELP!!

Try to boot up in Safe Mode. Hold down the "Shift" key as soon as you turn on the computer. This will force a check of the directory, turn off extensions and login items and more.
If that doesn't work, I recommend booting from the Mac OS X install disk and using disk utility to check the drive. Slide the install disk in the drive and then restart holding down the "C" key. Keep holding it down until it is booted up. From the menu select "Disk Utility", then highlight the hard drive, then click "Repair Volume".
Lastly, if that doesn't work - go get a copy of DiskWarrior which is known to fix just about any hard drive problem. Everybody should have a copy of this on hand anyway.
Good luck!!

My MacBook keeps freezing during startup

I got my MacBook Pro in 2012. Currently, it keeps freezing while I try to turn it on. I get the apple logo and the spinning wheel, and eventually it freezes. I've tried starting in safe mode and it froze. I've tried recovery, it "restarts due to a problem during start up" and then freezes again. When it freezes, there are little green pixels on the screen as well.
Any help is appreciated! Thanks!

I got my MacBook Pro in 2012. Currently, it keeps freezing while I try to turn it on. I get the apple logo and the spinning wheel, and eventually it freezes. I've tried starting in safe mode and it froze. I've tried recovery, it "restarts due to a problem during start up" and then freezes again. When it freezes, there are little green pixels on the screen as well.
Any help is appreciated! Thanks!

Hello, My Imac is freezing during startup.

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