IMAC 27" MID 2011 BLACK SCREEN WHILE BOOTING

olgagianolgagian Posts: 1Member
Greetings. I have an imac 27" mid 2011 and when it boots after several hours, it starts the booting proccess normally and suddenly the screen is becoming black and resets  the Imac.This is happenind twice and sum cases once and then the imac freezes at the apple logo, i switch off from the power button and when it starts again it boot normally..Does anyone have the same or similar  promblem? my Imac has 16gb of ram upgraded.
thanks

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