crwdns2934241:0crwdne2934241:0 Tony G

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Why is the fan loud on bootup

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LCD Screen is disconnected. Has Mac chime. Has external video. Fan  gradually gets loud. Does not complete booting, it restarts.

Reset SMC and PRAM, no change.

Note: When resetting PRAM. The 1st mac chime is at normal volume, the 2nd mac chime is at much lower volume.

Please help!

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iMac Intel 27" Retina 5k Display

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open