Hi my A1312 will boot up and get to login in screen when I enter password the machine will just power off like power was turned off and then it will reboot to login screen and do the same again. I love the machine for video editing so would like to get it going again...any ideas Guys please!
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A1312 Mid 2011 Power off after Login
- Thread starter Paraicf
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Yeah, I'm thinking I might have to replace alright which is a shame as it had been running great, if I can get my hands on a gpu I'll swap out but I replaced it about 18 months ago but who's to say that wasn't 10yo too!
Almost all of the GPU you can find on the market were salvaged from old/dead iMac. I wouldn't bet on them.
Try a Quadro K610 or K1100m if you can find one cheaply. These cards come from old workstation laptop, and they has much lower TPD, therefore may last longer.
When the GPU is dead, normally the machine does not make it to the login screen.
I'd suggest to do the following:
- insert a blank USB thumb drive, ~ 16GB
- go into "Internet recovery", and re-install macOS onto the thumb drive. That way, you don't need to re-install your existing machine, and you can get to the original state by simply unplugging the thumb drive.
- boot from the thumb drive.
If this works, it is simply a software issue. If this also not works, it will be something from the hardware.
You could also run Apple Diagnostic Software (Apple ASD145A for 2011 iMac). I find this more complex than installing onto a thumb drive.
The key combinations for internet recovery and 'boot from other disk' can be found in the web.
I'd suggest to do the following:
- insert a blank USB thumb drive, ~ 16GB
- go into "Internet recovery", and re-install macOS onto the thumb drive. That way, you don't need to re-install your existing machine, and you can get to the original state by simply unplugging the thumb drive.
- boot from the thumb drive.
If this works, it is simply a software issue. If this also not works, it will be something from the hardware.
You could also run Apple Diagnostic Software (Apple ASD145A for 2011 iMac). I find this more complex than installing onto a thumb drive.
The key combinations for internet recovery and 'boot from other disk' can be found in the web.
Thanks for the info, I was looking at the K4100M looks like it should work but need to fine out if it's a plug and play upgrade, I'm running El Capitan and most seem to mention Big Sur not sure about upgrading that...
Thanks Man, I'll give it a try during the week, FYI when I boot into Safe mode the machine runs for a little longer but still just goes blank and reboots, thought it may have been HDD problem but I mirrored hd to SSD and same thing. Thanks.
Update.. I carried out the old "Shake N Bake" and what u know....it worked, but for how long? I have a replacement card ordered so will use the baked one for a while and see what happens🤞 I baked at about 210 for a good 25 minutes, I treated the edges of the gpu with some flux hoping that would run in around the solder under chip.
Thanks Guys.
Thanks Guys.