iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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iMac late 2009 will only start in 'safe' mode, why is this?

Hi there,

I'm new to the Mac platform. I've been using one for 1-2 months and now I have a problem with my iMac 27" late 2009, Procesor 28 GHz Core i7.

For few days I made an Update for OS and after that it start /boot not in normal mode. I can use it only in Safe Mode with key "Shift" at start up.

What happened and how to fix it?

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How much RAM is in your system and what is the OS you are trying to run Sierra or High Sierra?

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I installed High Sierra on this identical machine last week but did a clean install with no issues. Did your installation complete or did it hang? How much free hard drive space do you have now?

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I have 8GB RAM and 1TB disk space. First I installed Sierrea after that I try to install High Sierra but no success. And one more thing my screen show some blue lines or blue small squares.

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I've been fighting this problem since March.. It started after the upgrade to Sierra. (Not clean install) Blog after Blog blames the 4850 graphics card.. I did find one interesting thing.. the Sierra upgrade does change the Graphics Driver to another model i think at2000. It Does hang around 55% in normal mode.. Apple "Genius" bar did a cursery diagnosis and found nothing wrong.(thy dont touch anything that old). A Mac authorized repair center couldnt figure it out.. for $75.00 . Im like most.. that my IMAC is like a pet ..and i dont like the thought of putting it down. but after banging my head against the wall..its time to give up the ghost.. I soon realize that it wont be long before the updated opperating systems wont be backward compatible.. I hate to use the title to a Frozen song... But..."Let It Go"

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Sounds like you are having GPU issues, a known problem on this model. When you try to boot is it hanging at about 55% of the load bar progress?

Hook up an external monitor and see if you get the same type of artifacts on its screen.

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I hooked a second monitor it show only blue screen and in Safe Mode it not work

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Boot up holding down the option key and go to the repair partition and boot. Run Disk Utilities and see if you can get it straightened out.

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i have made this but the Disk Utilities dont show any error

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Try reinstalling the system. There is also the possibility that you have viruses preventing a full boot up if this was an upgrade rather than a clean install. If you have access to an external boot source give it a try.

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I made a new Install from USB but it dont help. I delete all content from my HDD with disk utilities

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SOLVED... for me at least.

My iMac won't get past the half way mark in normal mode either... Well the frustration reached a point that I didn't care if I scrapped the whole machine.

So I dismantled it and got at the graphics card out I then took the graphics card apart and baked in the oven (according to a youtube video, at 200 Celsius for like ten minutes. I then took a heat gun (not a blow dryer) and heated the main chip directly till it reached temp.

I put new heat sink paste on and re-assembled it to my amazement it started completely... . So it was the graphics card! At least for me.

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Tatar Jony will be eternally grateful.
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