I have a Late 2013 iMac 27, which has been trouble-free since I bought it at the very end of 2014, until two weeks ago, when it spontaneously shut off while I was using it, and then could not be restarted. One line summary: imac spontaneously shut off while in use, won't power back up at all, doesn't seem to be the power supply, so what is it likely to be? It features the NVIDIA GeForce GTX 775M graphics processor with 2GB memory.Hoping somebody here can help with ideas on what might be wrong.
The high-end 27-inch iMac features a 3.4 GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.8GHz), 8GB RAM (configurable to 16GB or 32GB), and a 1TB 7200-rpm hard drive (configurable up to a 3TB Fusion Drive or 256GB, 512GB or 1TB of flash storage). NVIDIA GeForce GT 755M graphics processor with 1GB memory. The low-end version of the 27-inch iMac features a 3.2 GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.6GHz), 8GB RAM (configurable to 16GB or 32GB), and a 1TB 7200-rpm hard drive (configurable up to a 3TB Fusion Drive or 256GB, 512GB or 1TB of flash storage). It features the NVIDIA GeForce GT 750M graphics processor with 1GB memory. Like the entry-level iMac, it features 8GB RAM (configurable to 16GB), and a 1TB 5400-rpm hard drive (configurable up to a 1TB Fusion Drive or 256GB or 512GB of flash storage). The high-end version of the 21.5-inch iMac model feature quad-core Intel Core i5 processors at 2.9GHz (Turbo Boost up to 3.6 GHz). It has 8GB RAM (configurable to 16GB), and a 1TB 5400-rpm hard drive (configurable up to a 1TB Fusion Drive or 256GB or 512GB of flash storage).
The entry-level 21.5-inch iMac features a 2.7 GHz quad-core Intel Core i5 (Haswell) processor (Turbo Boost up to 3.2 GHz) and the new Iris Pro graphics. New iMac specs, processor speeds and graphics
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