27" iMac doesn't boot past white screen, not-responsive
Yesterday, I was working in Autodesk Maya, and suddenly whole screen went black, so I did a hardware reset, by holding down the power button.
After that the iMac doesn't boot properly. It does the chime sound, then the apple logo with indicator and then just goes to a white screen. The keyboard doesn't work as caps-lock light wont come on.
I have tried the following:
- RAM reset (Cmd+Opt+P+R)
- SMC reset (unplugged power source for 2-3 hrs, held down power button for 10 sec)
- Removed ram cards and powered up, it did the SOS beep with 5 second intervals, so I'm guessing logic board is fine
- Holding down Option key during startup brings up the disk selector (I have 2 partitions one with Lion and one with Mountain Lion) neither boots up.
- Tried booting from an external Mountain Lion Install USB drive, it shows up in Disk Selector, am able to select it, but then it stops at white screen
- Ran a thorough Apple Hardware Test off the internet through ethernet cable, took 1:45 hours and it showed no errors
- Tried to run through Mountain Lion Recovery Disk, same white screen
- Entered sIngle user mode (Cmd+S) and ran fsck -fy on boot disk, it gave a few minor errors, so I repeated fsck -fy a few times until it no longer gave errors, still doesn't get past white screen. I'm able to browse the HDD in single user mode using the shell. Then did "exit" and also "reboot" commands, both ended in white screen.
I've looked around and found several guides dealing with this exact problem, but as you can see from the elaborate list above, none of those remedies have worked for me.
Any help is greatly appreciated, I'm on a tight deadline to finish this animation project and this is the only machine I have access to at the moment.
I don't have Apple care nor warranty and there's no Apple store/Genius Bar nearby.
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Sorry, don't have a solution, but I am experiencing exactly the same problem. I do have a spare SSD drive with Mountain Lion installed as a secondary boot disk and tried Target Disk Mode via Thunderbolt, but again, I didn't get past the white screen.
Plugged the MacBook Pro in to the iMac using Thunderbolt and Target Disk Mode, and Disk Utility reported that everything on the iMac was fine.
Unhooked all the peripherals in case of a dodgy cable or peripheral and restarted, but no luck either.
Disk capacity isn't an issue, as I have some .95 TB remaining on the main disk. Fragmentation might be, but it'll take hours and hours using iDefrag.
Wow! That's great news. I sent my iMac off today to Apple Authorised Service Centre to have the video card replaced, and it looks like I'm going to be refunded the £309.xx pennies to repair it!
Well done Apple for doing the right thing, I say, and a heartfelt thanks for posting the link. I had no idea this was a known issue, so I really appreciate it.
Same Problem Here. 27" iMac 2011. No boot to USB or CD. Finally I just changed the Hard Drive which was a Seagate Barracuda 7200.12 1TB. These are know to have firmware issues. There is an update you can do if you go to the seagate website and download an iso and burn to CD. I suggest doing this if you know you have this Hard drive before the problem arises. After I switched HD's everything is back to normal. I think the HD is somehow grounding out the mother board. Glad I caught it before serious damage occurred. I wonder if I can file suit.
Had an unresponsive iMac 27 with frozen white screen at startup. After multiple unsuccessful attempts, called Apple support and they directed me to a few steps which didn't work, then to a COMM+R and reinstall the OS. After this, computer started, very sluggish. I have an airport where I've been backing up my computer for a long time. I restored to a few days ago, and after that basically back to normal. Good luck to all...
iMac 27", white screen.
1. Tried command + R = white screen > little apple logo > wheel > white screen.
2. Tried power on + shift key = white screen > apple logo > white screen.
3. Finally the following worked! "command + S" = terminal, where I typed the commands posted above for this, reboot .... restarted with power on + option + N. This solved my white screen problem. System restarted, Finder, Desktop, etc , etc, Thanks so much!!!!
door Efrain De Luna
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