An iMac that won’t start, starts with no picture or shows lines and artifacts usually has a logic board, graphics or power supply fault. We test all three before quoting, so you only pay for what’s actually broken.
Common faults
- No power, or power that cuts out (often the power supply rather than the board)
- Chime or fan noise but no picture
- Graphics failures on 2009–2011 and some 27-inch models
- Bulging capacitors on the iMac G5
- Damage after a power surge
Getting inside
From 2012 the iMac’s screen is glued in place. We remove it with the correct tools and re-bond it with new adhesive after the repair, so the screen sits flush and dust stays out.
Choose your model
- iMac 24-inch M1, M3 & M4 (2021–2024)
- iMac 21.5-inch slim (2012–2019)
- iMac 27-inch & Retina 5K (2012–2020)
- iMac Pro 27-inch (2017)
For other iMacs, see iMac repair and choose your model.
Price
Logic board repair is £450 + VAT on 2018 and later models, and for complex repairs (liquid, lightning or GPU faults) on any model. Non-complex board repairs on earlier models are from £165 + VAT. The initial assessment and advice are free, as long as we don't need to open your Mac. If a technician needs to open it and spend time diagnosing the fault, or you need a report for an insurance claim, it is booked in as a diagnostic at £45 + VAT (£54). All prices are subject to inspection, and nothing is done without your approval.
Questions we’re often asked
My iMac clicks and won’t start. Is that the board?
More often it’s the power supply, especially on 27-inch models from 2009–2011. We test it under load first.
Book online
Fill in our online booking form and you get your job number by email straight away. Not sure what you need? Call 020 7394 2528 for free advice.