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Question: OS install

Cannot get my IMAc working. Tried latest software update but screen keeps looping back to tell me it could not install and mouse etc will not work so cannot do anything other than turn off at mains and start again, which loops back to same screen . Any help welcome, as cannot use apple support because that requires serial number and I cannot get to that screen to get it as stuck on the one in the image!!!! Help :User uploaded file

iMac, iOS 11.2.5

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Mar 4, 2018 11:37 AM in response to BKL In response to BKL

Would be helpful to know exatcly which iMac you have. If it's a mid 2011 or later it should be able to use internet recovery by restarting while holding command-option-r to reinstall the original OS, after that you can upgrade. About macOS Recovery - Apple Support

If you insist on calling support your serial number is on the underside of the iMac foot.

Mar 4, 2018 11:37 AM

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Question: OS install