System: iMac 27 inch 2011, model iMac12,2
GPU: AMD Radeon HD 6770M
Memory: 8GB
This iMac didn't boot properly anymore. It showed the gray boot screen and just stayed there without loading the desktop interface.
My guess was the GPU was defective, so I ordered a replacement from eBay from a trusted seller.
After replacing the defective GPU the iMac booted fine again.
One thing I notice now is that the screens seem to dim at full brightness. I compare to a 2012 27 iMac from which I understand should be about the same brightness.
So I'd like to know how to go about troubleshooting this issue. I already tested target display mode where i used the older iMac as the target display which also gives a dimmer image from the newer iMac. Using the 2012 iMac display from the 2011 iMac gives the right brightness on the 2012 imac's display.
On the images the left is the 2011 iMac.
Any ideas?
Thanks!
GPU: AMD Radeon HD 6770M
Memory: 8GB
This iMac didn't boot properly anymore. It showed the gray boot screen and just stayed there without loading the desktop interface.
My guess was the GPU was defective, so I ordered a replacement from eBay from a trusted seller.
After replacing the defective GPU the iMac booted fine again.
One thing I notice now is that the screens seem to dim at full brightness. I compare to a 2012 27 iMac from which I understand should be about the same brightness.
So I'd like to know how to go about troubleshooting this issue. I already tested target display mode where i used the older iMac as the target display which also gives a dimmer image from the newer iMac. Using the 2012 iMac display from the 2011 iMac gives the right brightness on the 2012 imac's display.
On the images the left is the 2011 iMac.
Any ideas?
Thanks!