imac 27 late 2013 black screen until after several restarts

Mini DisplayPort output with support for DVI, VGA, and dual-link DVI (adapters sold separately).Four USB 3 ports (compatible with USB 2).Support for Apple iPhone headset with microphone.Headphone/optical digital audio output (minijack).Support for Target Display Mode via the Thunderbolt port using a Thunderbolt to Thunderbolt cable (sold separately).Support for extended desktop and video mirroring modes.

Simultaneously supports full native resolution on the built-in display and up to a 30-inch display (2560 by 1600 pixels) on an external display.NVIDIA GeForce GTX 775M graphics processor with 2GB of GDDR5 memoryĬonfigurable to NVIDIA GeForce GTX 780M with 4GB of GDDR5 memory. NVIDIA GeForce GT 755M graphics processor with 1GB of GDDR5 memory 8GB (two 4GB) of 1600MHz DDR3 memory four user-accessible SO-DIMM slotsĬonfigurable to 3TB hard drive, 1TB or 3TB Fusion Drive, or 256GB, 512GB, or 1TB of flash storage.27-inch (diagonal) LED-backlit display with IPS technology 2560-by-1440 resolution with support for millions of colorsģ.2GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.6GHz) with 6MB 元 cacheģ.4GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.8GHz) with 6MB 元 cacheĬonfigurable to 3.5GHz quad-core Intel Core i7 (Turbo Boost up to 3.9GHz).

Imac 27 late 2013 black screen until after several restarts