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).
One last point I’m assuming you haven’t opened the system if you had at some point, you could have a damaged display cable or the backlight power cable. So, replacing the power supply is quite easy, but fixing the backlight logic on the main logic board will take some skills. I do strongly recommend using a good fill-in UPS and use surge suppressors on all your gear so there is no unprotected connection to your system either USB/Thunderbolt ports or network via Ethernet. One of the things we have seen is the newer ‘Thin Series’ iMac power supplies tends to be more sensitive to power fluctuations. Did you get an error message? Let us know.
Your external monitor won’t display so you’ll need a flashlight aimed at the display so you can make out the screen and the steps. So how can we isolate this down? Have you tried running the onboard diagnostics? Restart your system and press the D key. That leaves us with either a power supply or LED driver logic on the logic board. So the display is the less likely the issue here. If we think this through, the LED’s within the display are driven in sets, so if one LED had died then the other LED within the given set or even the other sets would be lit. Lets backup here a bit… There are three parts involved in the backlight
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