If your iMac Unibody (2009–2011) needs power supply repair, our London technicians can help, usually with a quote on the same day you bring it in.
The power supply in the 27-inch A1312 is a common failure. Symptoms are no power, clicking or shutdowns. We test it under load and replace or repair it, then check the logic board for knock-on damage.
About this model: The 2009–2011 unibody iMacs (A1311 21.5-inch and A1312 27-inch) have the magnetically held glass, which makes getting inside easier than later glued models. They have four RAM slots behind a door and a 3.5-inch hard drive.
Signs it needs power supply repair
- No power
- Shuts down randomly
- Clicking noise
- Burning smell
How we do it
We test the power supply under real load (a multimeter check without load can pass a failing unit), then replace or repair it at component level where a new unit isn’t available.
Because a failing supply can damage other parts on its way out, we also test the logic board and drive afterwards.
At a glance
| Years | 2009–2011 |
|---|---|
| Processor | Intel Core 2 Duo, then Core i3/i5/i7 |
| Storage | Standard SATA drive |
| Memory | Socketed, upgradeable |
| Power / charging | Internal mains power supply |
Before you bring it in
Tell us whether it does nothing at all, clicks, or starts and cuts out, and whether there was a recent power cut or surge.
Which model do you have?
This page covers the iMac 21.5 & 27-inch Unibody (2009–2011) (iMac10,1 / 11,x / 12,x; A1311, A1312). About This Mac in the Apple menu shows the model and year; the A-number is printed on the underside of the stand. Not sure? Bring it in and we’ll identify it for you.
Price
We give you a fixed quote after a free initial assessment, before any work starts. 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
Is a Mac this age worth repairing?
It depends what you use it for. For recovering data, running legacy software or keeping a working studio setup, often yes. We give you the cost upfront and an honest view on whether it makes sense.
Is there a warranty?
Yes, our repairs come with a warranty on the work and parts. Ask us for the terms that apply to your repair.
Book a repair
For a free, no-obligation quote, call 020 7394 2528 or email info@mac-repair.london.
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.