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...

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Blue screen, computer will not boot up

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Sounds like your system is hosed. Try [repairing the hard drive with Disk Utility|http://support.apple.com/kb/TS1417]. Of course, from the sounds of it, even if you get the drive repaired, it may not fix the problems with your system.
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Firstly let me say Hello all ^_^ Secondly, I hope this is posted in the right forum. :Oops:
The problem started a few days ago when my iMac went into screen saver mode and the whole screen had frozen and become pixlated with squares and a general scrambling of the screen, noise, grain, etc.. It wouldn't awaken from it's slumber so I did a hard restart.
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The apple genius' are booked solid till next Thursday (27th) so I decided research and trial an error were my best options.
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Apple logo appears
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Tried zapping the Pram (Shift, option, p & r on chime, Wait for 3 chimes)
Removed RAM 1 at a time tested in other slots, no change.
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Reboot from here, same Vertical Magenta and green (sometimes just Green) Lines with static, Apple Logo, Spinning gear and freeze.
So connected with firewire into target disk mode. (connect mac book pro to imac using firewire cable and hold down the T key on your target computer, in my case my iMac) This essentially makes the imacs hard drive into an external firewire drive. Hard drive OK. Backed up. YAY. (most relieved to get back photos & current work)
Thanks for bearing with me on this epic post. ;);) and thanks in advance for sharing the knowledge.

Maybe this is a little late since this was last year but I thought I would post what the actual problem & solution was.
I took the iMac into see the Genius' and as it turns out it is indeed the graphics card. Luckily enough for me my iMac was just before they started soldering on them onto the logic boards AND it's one of the known faulty Nvidia Cards, which means a free repair, (luckily)
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21" iMac getting white screen and does not boot up

Hi All!
This is my first time to post here but have been using Mac OS since 2009.
I am having issues with my Mid 2011 iMac 21". I keep getting a white screen and it does not boot up.
I am a bit technical so I have done all the necessary steps as below:
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Message was edited by: AMILLIANZE

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

First the problem:
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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....
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IMac not booting up... need help!!

Hey guys,
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amitabh wrote:
It seems odd that apple would send out an update that would cause this kind of a problem.
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Any flashing lights and beeping sounds?
Sorry because of different timezone I might not be able to help/reply you right away.IF that happens I deeply apologize!
**Click the White thumb if you like the answer.**
**Please mark Accept As Solution if it solves your problem and only solves your problem, if you have any more questions please ask, this also helps others to solve related issues.**
Feel yourself like home here, we are all happy to help, if you have an question reply or start a topic or pm me or an expert.

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Thank you. That's what I thought will need to happen.
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Hey i kind of have the same issue.
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Hey FloydC,
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http://support.apple.com/kb/TS1367?viewlocale=en_US
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http://support.apple.com/kb/HT5860
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IMac not booting up - getting stuck on blue screen

Hello, first post here.
I have an iMac which I powered down last night and came this morning to boot it back up. Unfortunately it was having troubles booting up. It got stuck on the blue screen, kinda switching back and forth between two shades of blue and occasionally displaying the mouse and spinning load icon.
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Thanks

Hi J
Welcome to Apple Discussions
That sounds almost like a failed Leopard install:
http://support.apple.com/kb/TS1545?viewlocale=en_US
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http://support.apple.com/kb/HT1710
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Hello sprdthewrd,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
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Shut down the computer.
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Sudden screen lines + iMac not booting

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