IMac 5K going mad

My iMac 5K (fastest version) has suddenly slowed down dramatically while the ventilator is constantly spinning at full throttle. Rebooting doesn't help. Any remedy? Thanks.

Post an EtreCheck report of the computer and we can look for obvious issues. However first try doing both a SMC and PRAM resets.
Finally if we cannot find anything you have a 1 year warranty on the machine and if it's less than 90 days old or you have already bought AppleCare then you should be in touch with AppleCare immediately.
Intel iMac SMC and PRAM resets
EtreCheck

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    Apple guarantees their work, take it back.

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