I put now my macbook pro in fw mode and on the second attempt i managed to boot. But, i then thought, if everything expect the HDD was fine, then the iMac should start normally. Unfortunately, the system seemed to hang up, but i have to admit that i could leave it a little bit longer in order to see what will happen at the end. If the OS would load fine then it would be a HDD problem. I want to add that i tried to put my macbook pro on FW mode in order to chose it as startup disc from the iMac. So if it truly was a test of all iMac's fans, then how he concluded that there is a problem with the graphics card?Hmm. So i think that he just checked the fans of the system? And this fan check showed problems on the graphics card fan(!?).i was there when this operation took place, but i didnt know what was going on. I immediately wrote an email to the technician asking him if what he did is to run the fan control check program. What draw my attention was the fact that the EFI service diagnostics UI, is different from the one that technician run.then i think i remembered a post on the apple service diagnostics thread, which referred to the fan control something.i got really suspicious. Reads the entire HD checking for slow - read failures.ĮRROR - Reading took longer than the average time

Short random multi-block test test 1 - Full Read Test (DMA Full Read Scan at 1250) System turns on motor and verifies that the motor is on.ĮRROR - Motor did not reach target speed in timeī. When i returned home after 2 hours the EFI test was almost complete!!! 2 errors found. 'the money for the replacement of the graphics card!.' i thought. So i decided to run the EFI one more time and just leave it.i went to play a bingo.

'probably it is the graphics card that cause the screen to froze, but the timer is running'.įrom my nature i am a perfectionist, and many times i believe that people dont give all of their efforts on resolving a problem of someone's else. Then exactly i remembered the words of the technician. I tried 2 times to run the EFI service diagnostics and i noticed that the iMac seemed to froze after 40 minutes, although the time was running. I managed to find apple service diagnostics and after many many unreasonable errors of disk utility i managed to put it on a usb. He could not answer what is the cause of the these problems. So something else might be the problem that on second time triggers problems to the graphics card and to the HDD. I explained to him that i dont think this is the best way to follow, cause ten days ago, as you read, i replaced the HDD already. He proposed to replace the graphics card and afterwards the HDD. That moment i left the technician to do the rest. Technician decided to do a hard reset, an when he pressed the power button, boom! The desktop appeared. Last thing he did, he boot from an external hard drive. 2 errors found: one red warning for the graphics card and one orange/ yellow for the HDD. White screen again.Īfterwards, he tried to start something like hardware test (edit: finally i learned that was the cooling diagnostics) but from the local network. First thing he managed to do is to start the computer. Today i went to an apple authorized technician. I tried to see iMac from Macbook Pro via firewire but with no luck (firewire logo was flashing on the screen of iMac though). I did boot from Verbose mode and there is an error message coming up write from the start when system is loading drivers saying 'failed to load AppleUSBblablabla.kext (i don't quite remember more from the name cause iMac rebooted and i didn't memorize it).Ħ. I pulled out the RAMS and chime does sound (check for logic board failure i found on Google, but i do believe it is a graphics or logic board issue).Ĥ. Three more times i tried to reboot it stuck on the Apple logo.ģ. iMac booted 10 minutes and freezed immediately, i could operate it at all.Ģ. Startup hangs on the Apple logo with the loading circle there. On the afternoon i found my iMacs screen freezed. Also there where times (few) with screen distortions and times (about 10, starting from yesterday) when the beach loading ball was appearing. In the morning iMac used to freeze when i was working with him. Pathologic symptomatology started the day before yesterday (1st day), continued with quite a bit different form yesterday (2nd day) until today (3rd day). Everything was working great!.for 1 week. I replaced the default Toshiba HDD with Seagate ST31000524AS 1TB, and i installed Lion on it. After extensive test i four that probably is a HDD failure. My iMac one day on boot presented a white screen with a folder with a question mark on it.

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