My Imac is showing gray screen with red line when booting and restarts again

My Imac is showing gray screen with red line when booting and restart again, I can load it in windows 7 safe mode with red lines across the display, pls help

The graphic card is damaged. You can't do anything more than taking your computer to an Apple Store or reseller and getting your graphic card replaced.
Sometimes, when the graphic card is damaged, operating systems can't start. That's caused because the drivers that make the graphic card work detect an error, telling the operating system that the graphic card is unusable, so the operating system can't start and it restarts. However, you can start in safe mode because operating systems use a basic driver in this startup mode

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Just in time for my birthday...
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Occasionally its fans would rev up to the maximum and stay there until computer is restarted or put to sleep. But today the fans were blowing (albeit more moderately) from the start. Previous solutions would not help and iMac would even put itself to sleep after a minute or less.
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I have Time Machine, so I happily formatted and started installing Lion. But during install, every few minutes or even less, computer would go to sleep again. Despite that install managed to continue, but when it got to "Downloading additional stuff" part, progress stopped and countdown even started to go UP minute by minute.
I figured that every time iMac went to sleep (because probably it thought it was overheating) download had to start again and it would never finish. So I cancelled and restored Snow Leopard system from Time Machine. After booting from HDD, I verified it and it passed. But Diagnostics still won't launch.
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Apple Hardware Test comes installed on the hard drive by default, but it's deleted when you erase the hard drive or you upgrade OS X.
In your case, you need the Mac OS X DVD. If you haven't got it, call Apple to get replacement discs > http://support.apple.com/kb/HE57
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Hi,
Time to take it to an Apple store or Apple certified repair provider.
iPod Nano support here. http://www.apple.com/support/ipod/
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Grey screen no apple followed by blue screen with vertical lines. Graphics and logic board replaced 6 months ago. What to do? I held down shift, it gets HOT HOT and makes noises. (for safety mode) followed by a blank grey screen and blue screen

grey screen no apple followed by blue screen with vertical lines. Graphics and logic board replaced <6 months ago. What to do? I held down shift, it gets HOT HOT and makes noises. (for safety mode) followed by a blank grey screen and blue screen. Then tried the other way (sorry, I think it's command alt delete? I don't remember) and it turned from grey (no apple symbol) to blue blank. Then third time, grey followed by blue with vertical lines, not blocky clear lines that you can see if you are close to it.
Thanks for any help!

You have to take the computer to the Apple store to have it checked out.
Genius Bar reservation
http://www.apple.com/retail/geniusbar/
Best.

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I had a little issue with my Blackberry curve 8350i, but I think this might go with several models. One day my Blacberry updated an application and restarted, but when restarting suddenly I got a blank screen showing a battery sign with a red line. I took out the battery and put it in again, but no luck. I searched on many forums if anyone experienced the same as me. I found a lot of topics but no solution. I called tech support of my service provide and fortunatelly I talked to a tech guy who was willing to help. He said that this error message usually might appear when the battery is faulty, not original (not my case) or device is not working, but before taking a final statement he wanted me to try something first. He said to take out the battery, the SIM card and any extern memory card. Then to clean any contacts with air. I followed his instructions and after that the device worked again without any problems. I would like to share this experience on this forum maybe this will help other to to solve similar issues.
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Excellent advice! I just had the same thing happen to me and your post solution fixed my phone.

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There are some recovery steps for this condition outlined in the below article.
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Hi thanks for all the concern and replies. I've tried all that.
I had just got it back from the shop last Friday. It was there for around two weeks. It was a faulty GPU (when you see garbled display that's consisten when booting it the GPU). I have a strong feeling it's related to the Lion install 10.7 or 10.7.1 and may be similar to reports of Mac laptops overheating. It's good the GPU is removable, it might have taken 3 week or a month if it had been the whole board.
It's a blessing in disguise though as with all or most cases because I also got to have the LCD replaced for excessive backlight bleeding (in my opinion), the dead pixel from the previous LCD isn't there anymore (though under the glass there're some smudges but nothing crucial). The backlight bleeding is still the same though in my opinion but at least it's new.
It's a great thing I bought Applecare. I didn't buy it for the iPhone because that's more durable (my iPhone 3G's 3 years old now and it's still solid. Although there are scratches and a crack at the back at the bottom, got sqeezed under the table I think when I sat). I think Applecare is a good recommend for things that get hot like desktop and laptop Macs(are the iOS considered Macs btw?) which are twice or thrice the price of iOS devices.
Gbu.

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well i went to the apple store and went to the genius bar, they didn't tell me what caused my problem or what happened but they replaced my iphone! hopefully this doesn't happen again

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I buy the dirty theory as well. plug and unplug a whole bunch of times - you may be able to dislodge whatever is causing the issue. Also - make sure the plug is fully seated - (some of the pad jacks are vert tight, and you really have to work them in). I gather you are out of warrenty? Blow in the hole.
last resotr - take a toothpick, dip the end in fingernail polish, get rid of the xs, then very very gently, insert the pick and try to rub the contacts. very gently as you do not want to bend them.

What do I do if the screen turned black with red line across it and it wont resod?

I have tryed everything i could think of but it still wont wotk!!!!!!!!!!!

- Have you tried placing the iPod in DFU mode and then try to restore?
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- It sounds like the iPod is on. If it is, then let the battery is fully drained and then charge for an ahour and try to stuff again.

White Screen with revolving circle after boot and login.

Reset PRAM - Same Issue
Removed internal components and cleaned dust from fan, removed/re-inserted memory after cleaning with air. Same Issue.
Booted up in recovery mode (CMD R) and reinstalled Maverick. Rebooted..Same Issue.
Booted up in recovery mode and ran disk utility. Verified MAC HD1 and HD2..all good.
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Try a Safe Boot from the HD, (holding Shift key down at bootup), it may give you a bit more free space to boot with, if that is the problem, otherwise I think you may have to Intall MavX on the second drive & boot from that using alt key.

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I would back up the files and start looking at the HDD. Open DISK UTILITY>FIRSTAID.
Ciao.

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My Imac is showing gray screen with red line when booting and restarts again

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