The display can’t be changed or upgraded, but if you head the way of the iMac with Retina, you’re getting a different screen than the convention iMac, regardless. System memory starts at 8GB, though like the processor, this can be upgraded too, with 16 and 32GB choices, with upgrades also available on the storage side of things, starting at 1TB Fusion Drive (Apple’s combined conventional hard disk drive and solid-state drive concept), but providing either a 3TB Fusion Drive, or several flash-based choices with either 256GB, 512GB, or 1TB.Īnd there are even choices on the graphics side of things, as Apple moves to AMD for providing the graphics on this generation of iMac, starting with the Radeon R9 M290X with 2GB on the base model, but expanding it to a 4GB variant of the M295X graphics processor. Don't know.The new machine starts at $2999 in Australia, and while that’s a far cry and nearly a grand off the base model 27 inch iMac, the machine is a little different, with faster innards, more graphical grunt, and a screen that will make other computer makers go scrambling to update their competitors.įirst, though, let’s get to the insides, because in the iMac 27 inch Retina, you’ll find Intel’s fourth-generation processors, with two options available, the quad-core i5 clocked at 3.5GHz in the base model, though it can be upgraded to a 4GHz quad-core i7, as well. some kind of problem with the screen dedicated powerunit/card - if it have one. it's either a loose video cable connection.

The harddrive works - since everything other than the screen is working.

The backlit/screen light works - since I still can adjust the backlight. The graphics card are ok - since everything works with an external monitor. You have to be quick.ĭo you know what's wrong with my computer? Turn the computer on and right after press and hold 'D'. To perform the Apple Diagnostic turn off your computer, remove everything else than power chord, mouse and keyboard. But is it possible with a external monitor? I want to perform an Apple Hardware Test/Apple Diagnostic on the iMac. Everything works except the screen on the iMac.

It is possible for me to use the computer with an external monitor. My screen have gone black and with flickering blue and yellow lines both horizontal and vertical.

Imac 27 late 2013 external display