Help my iMacs not booting up!!!???

It's a first generation iMac and qualifies for the power pack replacement.
The story....I left my iMac extracting a DVD using mac the ripper. (Backing up my DVD Movie)
When I returned, the fans were at full blast.
There was a mall black message box in the center of the screen in different languages "restart computer". Or something like that.
Held the restart button,
starts booting... grey screen...apple logo..but the logo turns into a grey square flecked with odd coloured pixels. The fans go at full blast.
What I HAVE TRIED:
Booting from system restore DVD using "C" still locks up at the apple logo stage, but the logo doesn't turn into a square.
Could it be
the power pack
The HHD (cant test at the moment.)
The CPU/motherboard
I have taken the back off, And booted the computer up. Everything seems to bee making the right sounds.
I noticed theres 4 small LEDs just to the left & below the main cooling fan. Only the first 3 light up when the computers on.
Thanks for your Help

The Universal Access preference pane allows you to turn on Mouse Keys. When Mouse Keys is on, you can use the numeric keypad to move the mouse. If your computer doesn't have a numeric keypad, use the Fn (function) key.
Mouse Keys
Keystroke Description
8 Move Up
2 Move Down
4 Move Left
6 Move Right
1, 3, 7, and 9 Move Diagonally
5 Press Mouse Button
0 Hold Mouse Button
. (period on keypad) Release Mouse Button (use after pressing 0)

Similar Messages

IMac not booting up... need help!!

Hey guys,
I got an update from apple yesterday for I believe it was a new update for quicktime, and after installing and rebooting I found that I had no control over the menubar and the dock, as I could not access anything the only thing I could think of doing is holding down the power button to restart. After doing this my iMac would not boot up past the initial apple logo boot screen and would just freeze at that, i've tried everything I could think of and have had no sucess.
If anyone can help me with some advice it would be much appreciated!
Many Thanks,
Richard Walker.
p.s. I have a broken superdrive and i am running the latest version of leopard.

amitabh wrote:
It seems odd that apple would send out an update that would cause this kind of a problem.
I can assure you that the problem is with you not the update. Remember this is a place for Mac users to come to with issues. The vast majority of us install our updates without a problem, primarily because of how out machines are maintained. I can only suggest contacting an Apple repair centre to have your Superdrive replaced so you can reinstall OSX. Whatever you decide, when you finally get things back, invest in a 3rd party Disk Utility like DiskWarrior as it's an excellent tool. By running it regularly as part of a maintenance routine, when you come to run updates in future, you shouldn't find yourself here again as a result. Good Luck.

27" iMac not booting after start up. HELP!

After being turned off for 8 hours, iMac won't boot up fully. After being stuck on white screen with apple logo and spinning loading icon for 20 mins, I held the power buttom down but still nothing.
Can anyone suggest steps to take?
Cheers
Sam

Hi Sam,
I agree with baltwo, If your Macintosh is behaving erratically or is not booting up all the way, you may want to try resetting the PRAM as per below;
1) Shut down the computer.
2) Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3) Turn on the computer.
4) Press and hold the Command-Option-P-R keys. You must press this key combination before the grey screen appears.
5) Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6) Release the keys.
This resets the PRAM
PRAM is a type of memory found in Macintosh computers that stores system settings. These settings include display settings (like screen resolution and color depth), the time zone setting, speaker volume, and the startup volume choice. The system settings that are stored in the computer's PRAM differ from Mac to Mac, but the purpose of the memory remains the same.

Sudden screen lines + iMac not booting

Hi everyone:
I have an 24" Intel iMac, only 4 month with it, it was working normally then I left and my computer entered sleep mode, when I came back I prssed the keyboard to wake my computer the screen was black with green stains, I did reset, and on the boot screen with the apple logo it has lots of vertical lines and Leopard not booting instead it stays on a blue screen with white stains, I did hardware test, on it it showed the red lines but when I move the mouse over them they dissapear and on a space without lines thay appear again... Hardware Teast said it was all ok, I tried to boot from the Leopard Instalation Disk but it doesn't work neither, it finishes in the same blue with white stains screen, I don't know what esle to do...
Help much apreciated!
-Eric Bartolome

Ok, I discovered I can enter Fail Safe boot, I'll try updating Mac OS now...

IMac not booting from HD, cannot repair disc in Disk Utility

First the problem:
I've had the imac G5 for nearly two years and its been running without a problem, now it suddenly wouldn't start up. Firstly I get two or three grey screens in succession looking as if being drawn from top to bottom very quickly, then the apple logo and timer, after a minute or so the fans start up to full power and it stays that way.
What I've tried:
Reading around discussions I tried rebooting from DVD installer and using disk utility. Result: error message: The underlying task reported failure on exit. 1 volume could not be repaired because of an error.
Because I want to sell the imac I had backed up all of my important data so I zero-wrote the hard drive in preferrence to buying a third party repair package. Reinstalled from DVD. Shut down and restarted. Everything worked except those banding grey screens appeared that were never there before. Something looks wrong. Then when i tried to reinstall microsoft office (as a test) the OS seemed to freeze and I had to shut it down again. Now it won't boot up as before. This looks like a very serious problem.
I hesitate to buy tech tool pro in case that doesn't solve it either.
Can't think if I did something to cause this. All I've been doing is transferring some data via ethernet to a newer mac. There was also a Lacie firewire drive linked to both computers as i was backing up stuff. One night I shut the iMac down and the next day it started with this problem.
Well... any educated suggestions would be most welcome,
thanks.
By the way, the memory in the mac was purchsed from a third party and installed ages ago by myself. Never been a problem with it and have been running Final Cut Studio no trouble.
iMac G5 2GHz Mac OS X (10.4.7) RAM 2GB

Long story short, I had the same problem last week, just after installing the latest software updates. I went through all the resets and disk utility verification (multiple times with phone support -- Apple Care), then took it to the local Apple store b/c nothing worked. They couldn't figure it out either and recommended that I try to backup my data on my bootable external drive before they started messing with my hard drive, since Apple stopped providing this service. I brought it home, could not boot from my external drive, so booted from the disk again, just for kicks I ran the same verification process (this was the 3rd or 4th time). This time something happened but it still failed. So I ran it three more times (each time something new happened and then it failed, until the third time when everything worked. The only problem now is that I seem to have lost all sound???? I did immediately make a duplicate of the Imac hard drive. Any thoughts on how to get my sound back? hope this helps....
Imac G5 20" Mac OS X (10.4.9)

Imac Not Booting From CD

I've tried just about everything at this stage, so I'm here asking for help. I have an Imac, of which I can log into the root account and has no openfirmware password. The Macos ISO is seen from within Macosx, though I cannot get it to boot from cd, whether holding down the "c" key or setting that device to boot up first from the startup disk menu. I have tried resetting the pram and nvram and reset-all within openfirmware, and the "boot-device" command within openfirmware shows exactly the same as another machine which does boot from cd. I know that both the drive and (multiple) CD's I've tried are functional.
Can anyone point me in the right direction as I am at a loss at the moment and have no further idea's of my own.

n0der,Welcome to Apple Discussions.
Is the Optical drive known good? can you read other disks?
If not do you have another Mac you could use Target Disk Mode on and hence use that Mac's optical drive rather than the iMac's internal...
Does Apple Hardware Test CD report any faults or will it not boot from that either?
mrtotes

11' iMac Not booting

I have a 2011 iMac 27" and it will not boot. It currently runs (ran) OS 10.8.4 and when its boots it displays the apple logo, the loading swirl, and a progress bar on the bottom of the screen, and when the progress bar fills, it disappears, and the computer continues to sit at the grey apple loading screen. When I booted using the disk selector (Option on startup) instead of saying Macintosh HD it now says EFI Boot along with the standard Recovery Drive. AHT test come back with no problems. This computer contains very important information, so hopefully it hasn't damaged any of that. What is it that i can do to fix this problem
Thank You
Macman45

Mac OS X: Gray screen appears during startup

Imac not booting, Able to get to disk ulility with snow leopard disk. Tap on had disk, not given choice to do anything. Information list that smart is certified and partition map is us formatted. How do I get mac to start up again?

Imac not starting up, keep getting white screen. Using snow leopard. Able to get to disk utilities with snow leopard installation disk. Tap on had disk, not given choice to certified disk or anything else. Information on disk states that smart status is certified. Partition map I formatted. Also tried to restore from back up, but get error: not enough disk space. Tried to erase disk, but unable. What do I do next to get mac to start up?

Thank you. That's what I thought will need to happen.
One more question. I tried using the Apple install disk that came with the computer. It's an OS 10.5.6 disk. It does not see my 10.6.8 system internal hard drive to repair. All it see's is itself 10.5.6 disk. Do you think I can use a 10.8+ disk utillity since that is a higher system it will see the 10.6.8. Where the 10.5.6 does not?
I don't want to turn the computer off for fear I'll get the question mark again. P-Ram got me going last time but for how long I don't know? It would be nice to be able to turn the computer off for the night and startup as usual to give it a rest and try to reset itself.
Thanks for your help, I know I will eventually need to re-install. But I am in the middle of a project with tight deadlines and all I can do right now is back-up. Trying to migrate to another computer temporarily to finish the job. That's a lot of extra work in the short time also.
Just trying to put a band-aid on it for another couple weeks.

HELP: MacPro sometimes not booting when powered up... Why?

My 3 year old Mac Pro (2.66 dual-core Intel Xeon processors) sometimes will not boot on powering up. The fans will whir like normal and the gong will sound but then nothing but a white screen... no hard drive noise... like the HD has not been triggered to boot... every time I push the power button to off... everything shuts down... then I immediately push the power button again same sequence and sounds... but this time the drive starts making its normal sounds and the machine boots properly.
I don' think it's the drive itself... but I'm wondering if it might be a drive controller that's going South.
Anyone seen anything like this happen before?

Then you have been cleaning it of dust, taking it out, making sure it isn't clogged; and probably running the fans @ 900 rpm (3 of the 4 anyway).
Could be X1900. Wait and see if 5770 is an option, otherwise the ATI 4870s work fine.
IF you can run Apple Hardware Test off your OEM DVD it came with ('D' on startup) and it is just the video card.
Might also play RAM-Riser tag and try with just one set of RAM and swapping Risers, looking for red light etc.

Please Help, K7n2 will not boot.

Hi,
I've had this K7N2 up and running for about a year now. It's an xp 1700 at 1833mhz. It has fun fine and stable with no overheating problems whatsoever. The problem is this morning I turned it on and it froze right after the cpu speed of 1833mhz was being reported. The led code on the back indicated it freezes during "bios sign on".
--I tried moving the speed jumper over to see if I could boot up at a lower fsb and clock speed. It froze in the exact same spot but with a slower reported clock speed.
--I then tried to clear the cmos by moving the jumper over for a few seconds with the power off and it did not clear the cmos, upon rebooting it acted as if it was still overclocked to 1833mhz.
-- I tried to clear the cmos by taking the battery out for 30 minutes with it unplugged but that didn't work either.
The question is, do you think my mobo is shot? or is it the processor? Any ideas, I'm very open to suggestions at this point. I noticed newegg has some newer reconditioned boards for cheap so I'm not to concerned at this point, just wondering if it can be salvaged.
Thanks,
Jay

Quote
Originally posted by Mr Burrito Man
Im a college student and my board is doing the same thing. It will not boot past the BIOS sign on stage. is there anything i gan do besides spend any more money. i lost one of my programming labs because of this STUPID MOTHERBOARD . i was using the computer just fine and BAM it restarts and freezes. my computer is dead and i have NO money. im really stuck please tell me something i can do.
What type of RAM are you using? Try one stick at a time and try relaxing the timings.

Early 08 iMac not booting - You Need to Restart Message

So after lunch today, I touched the shift key to wake up my iMac from sleeping. Screen came up, but it was totally frozen with distorted green digital "crud" in various places in the display. (no other way I know to describe the green stuff, it wasn't consistent lines or anything...just random distortion).
I powered down to restart, and the following message came up http://gallery.me.com/daveoli#100064 advising me I had to restart again. Did so, and same message. Tried the following methods, all resulting in the same message coming up:
Unplugged completed, waited an hour (in case of overheating) and powered-up.
Booted holding D key for h/w test - no test just got same message.
Booted in safe mode.
Booted from CD.
I called apple support, and the tech advised me to boot holding down cmd-option-r and then p to reset pram. 3 bongs, and then release....this worked! The mac booted up. First thing I did was connect firewire drive and make a back up. Ran a disk check with disk util and everything was ok. I then started to download the hw util from the mac site...and wham, screen froze again with the green crud.
This time, restarting with the resetting the pram did not work. Nothing gets me to progress beyond that "need to restart" screen. I will call Apple again in the morning...but in the mean time, any one here have any ideas or have seen this issue before?

That's a *kernel panic.*
They are usually caused by hardware problems, but can be software.
Disconnect all peripherals, except keyboard and mouse. Reconnect one at a time to see if you can find the culprit.
If that's no help, run the Apple Hardware Test, from the separate disc that came with your Mac.
more kernel panic info:
http://support.apple.com/kb/HT1392
http://www.index-site.com/kernelpanic.html
http://www.thexlab.com/faqs/kernelpanics.html

IMac not booting after putting HDD in windows machine

Hi, I'm helping a friend repair an iMac G5 ALS (before the iSight ones)
The main problem is that it keeps switching itself off, or just not turning on at all, but i have ordered a new power supply to fix that.
The other problem is that, before I did anything to the mac, I put the hard drive in to my Windows Vista machine to back up important files. But the drive didnt appear in My Computer. So, I right-clicked on My Computer, went to Manage and then the Disk Management service. From here I right-clicked on the Mac drive that had appeared on this menu and then clicked 'Initialize' (I had done this before on a Windows HDD so it seamed like the logical thing to do) but nothing happened. (I now know that it wasn't recognized by Windows because of the different filesystem on macs)
I put the HDD back in the mac and waited for it to start playing ball. Eventually it decided to turn on, but instead of booting, it came up with the flashing question mark folder. I put the Leopard disk I have into the machine and it booted to the Leopard installer.
Using the disk utility I found that the hard drive was there so I verified and repaired it and rebooted but still just the flashing question mark folder comes up.
I'm fairly certain that it was the 'Initializing' that caused all the boot problems.
Any ideas anyone? Cheers in advance.

Welcome to Discussions - you will have to reinitialize the hard drive as Mac OS Extended (journaled) before it can be recognized by the machine. Boot from the Leopard disc and after you have selected English as your language, go to Tools (or whatever it is called, I don't have it in front of me)in the menu bar and select Disk Utility and reformat the drive.

My iMac not boot

Hola, mi iMac murió, no arranca. Instalé bootcamp para utilizar software de windows en mi iMac, pero al iniciar el proceso mi computadora se reinicio, tardó un rato en una pantalla gris y después apareció una pantalla negra la cual decía: "No bootable device -- insert boot disk and press any key" y de esa pantalla no pasa. Ya no tengo acceso a mi computadora ni a mis archivos. Estoy desesperado, tengo archivos muy importantes ahi. Que puedo hacer? Me urge trabajar en mi iMac!!

I think I found a solution. But perform these steps at your own risk. And thanks again to J.C above!
First download the latest beta version of Onyx for Mac. Verify your disk, SMART status, etc. Then go to the cleaning tab and check off everything. Clean out all the caches. Now you can use Onyx or Disk Utility to verify and repair permissions.
If you have and iMac, you should reset the SMC by shutting it down, then disconnecting the Power Cable. It also doesn't hurt to hold the Power button down for 15 seconds. Then wait a minute, reconnect the power cord. Then reset the PRAM. For my Mac, I had to switch on my keyboard, turn on the Mac, then quickly hold Command, Option, P and R while booting. Hold them down until you hear the Apple sound twice.
After that, my Mac booted like lightning. Everything is fast and my fans are working properly. The OS is no longer glitchy and Wonky, but still had a startup issue.
Now for all you iMac users out there who get stuck booting into safe mode (which is my startup issue it seems), where airport (wifi) doesn't work and the graphics are messed up. The solution is kinda weird. Make sure when you boot your Mac, the keyboard and mouse are turned off, or any other BT device. Then the system will boot normally and quickly.
I don't like the solution for the safe boot, so I hope Apple comes up with a bluetooth or bootloader fix soon. As for all the Macbook Pros out there, I suggest like some others about resetting the PRAM and SMC may help you out, but bluetooth would not be the cause for your booting into safe mode with no wifi. You just have to reboot a few times and cross your fingers or go back to Snow Leopard until 10.7.1 comes around.
Hope this helps everybody!

2011 imac not booting after os x yosemite installed...just beeps with black screen

installed Yosemite and now my iMac will not start
no problems before...
signed in today after iMac booted...
then went to black screen and beeps
cannot get past...beeps with black screen

Hey FloydC,
Thanks for the question. I understand you are experiencing issues with your iMac. The following resource may help to resolve your issues:
Troubleshooting: My computer won't turn on
http://support.apple.com/kb/TS1367?viewlocale=en_US
Mac computers: About startup tones
http://support.apple.com/kb/HT5860
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
Thanks,
Matt M.

2011 21.5" iMac not booting past Apple logo

A friend of mine has had a 21.5" iMac since last fall. It's a 2011 model, which came with Snow Leopard preinstalled; however, as he was eligible for the free upgrade to Lion, I took care of that from him (basically, he's been running 10.7 since day one). It's been working well ever since, and I successfully managed to install Mountain Lion on the machine just a few weeks ago.
Just a few hours ago, Mail started acting up on his machine and I tried to help him. The symptoms, if they're at all relevant, were that a new message composition window wouldn't close if he clicked the "close window" button, and the send button was greyed out. I recommended a restart.
Here's where things got really interesting. The computer froze on the Apple logo. That is to say, initially, after the startup chime, the Apple logo showed up with a spinner; after three or four minutes (already abnormally long), the spinner vanished, but the Apple logo stayed. We left it like that for about a half hour, to no effect. I restarted a few times using the I/O button on the back of the machine, trying to eject any CDs using the "click on restart" trick, holding down the shift key to get into safe mode (with limited success: a loading bar appeared, then nothing happened for 20 minutes, at which point I restarted again) and to zap the PRAM, to no effect. I can't hear the hard drive's head clicking back and forth, as it usually does in my iMac, and tried booting from the recovery CD. Strangely enough, the CD drive spins up, then back down almost immediately, and we're back to square one, with an Apple logo in the middle of the screen.
At this point I'm completely puzzled; I've browed fora and message boards, and so far, nothing I've tried seems to work. My friend is reluctant to go to the Apple store, as he thinks that he'll lose all of his data that way (even though he's got a backup disk set up, with backups from just before the restart, going back about a month). Fact is, I'm not sure that there is a solution at this point, beyond taking the machine, which is still under warranty, to an Apple store.
What would be a good course of action at this point?

I tried starting up in safe mode. The loading bar showed up, filled up, and disappeared, and then, nothing. Just the Apple logo, for at least 20 minutes (I later restarted and tried zapping the PRAM, also without success).

Help my iMacs not booting up!!!???

Similar Messages

Maybe you are looking for