Hello, i have been trying to fix my fathers imac mid 2011 21,5 for a couple of weeks now. The main issue the mac was having was that it was unable to boot. I would boot into disk utility and try to reinstall mac os but it would crash. This got me to buy a ssd with the owc thermal sensor cable, after i installed the ssd the mac os installation would get further but would still crash at the end. I decided to take out the ssd and put it inside my macbook pro, download the mac os and then put it back into my imac. This got the imac to boot into the os atleast but a new problem would arise. Everytime i would go into google chrome or safari the app would crash after a minute or two. it would also throw me back into the mac os login screen occasionally. After a hour or two of runtime the mac decided to restart on its own, the progress bar went halfway and then i got a infinite white screen.
I did some more research and realised that this problem was common with these models, and decided to try and bake the video card at 200 celsius for 8 minutes. After the bake the machine would boot and run but the problem with the browser and login screen would persist. After checking the tempratures on the machine and a failed attempt to reinstall os failed (mac would still not boot into disk utility or reinstall os). I decided to try and bake it a second time but this time i would increase the temprature to 235 celsisus and put some coins on the chip. After this procedure the mac would boot normally but the browser crashing problem would presist, keep in mind the crashing to login screen problme dissapered. I tried disabling hardware boost mode in google chrome and some other thing without succses. I figured it had to be a software problem as i downloaded the os on my macbook pro and transfered the ssd over. so i tried to do a clean install of os, i formated the drive and reinstalled os. This time it was successful, so something must have improved. I stress tested the mac for an hour with 5 youtube tabs open, and no crashes. So i decided it was a success and went to bed. The next day i took the mac to my father, after a hour of usage google chrome would crash.
now im pretty stuck on what to do, i am thinking of trying to bootcamp windows on the machine to see if the problem presist there. If you guys have any solutions or experienced any similar problems i would really apreciate the help. if theres any info you need or any hardware tests you want me to dont hesitate to ask and i will do it as soon as possible. keep in mind i also get a google chrome crash report and osx installation "failed installation log" if thats any use to you.
thank you in advance.
I did some more research and realised that this problem was common with these models, and decided to try and bake the video card at 200 celsius for 8 minutes. After the bake the machine would boot and run but the problem with the browser and login screen would persist. After checking the tempratures on the machine and a failed attempt to reinstall os failed (mac would still not boot into disk utility or reinstall os). I decided to try and bake it a second time but this time i would increase the temprature to 235 celsisus and put some coins on the chip. After this procedure the mac would boot normally but the browser crashing problem would presist, keep in mind the crashing to login screen problme dissapered. I tried disabling hardware boost mode in google chrome and some other thing without succses. I figured it had to be a software problem as i downloaded the os on my macbook pro and transfered the ssd over. so i tried to do a clean install of os, i formated the drive and reinstalled os. This time it was successful, so something must have improved. I stress tested the mac for an hour with 5 youtube tabs open, and no crashes. So i decided it was a success and went to bed. The next day i took the mac to my father, after a hour of usage google chrome would crash.
now im pretty stuck on what to do, i am thinking of trying to bootcamp windows on the machine to see if the problem presist there. If you guys have any solutions or experienced any similar problems i would really apreciate the help. if theres any info you need or any hardware tests you want me to dont hesitate to ask and i will do it as soon as possible. keep in mind i also get a google chrome crash report and osx installation "failed installation log" if thats any use to you.
thank you in advance.
