Contents
When you press the Power button and nothing happens, it's rarely a good sign. But a Mac that won't turn on can hide very different causes depending on the model. After 15 years of repairs in our Berchem-Sainte-Agathe workshop, we've identified a fairly clear pattern.
Here are the most common causes, listed in order of probability:
| Cause | Frequency | Gravity |
|---|---|---|
| Totally discharged or faulty battery Cycles exhausted, swelling, dead cells | ~40 % | Moderate |
| Faulty charger or cable MagSafe or USB-C damaged, false contact, power surge | ~25 % | Low |
| Motherboard failure Power supply circuit, SMC, T2 or Apple Silicon chip | ~20 % | High |
| Old or recent liquid damage Progressive oxidation, short circuit | ~10 % | Variable |
| Blocking software problem MacOS update failed, firmware corrupted | ~5 % | Low |
An important detail to be aware of: on recent MacBooks equipped with Apple Silicon chips (M1, M2, M3, M4), the Power button also incorporates the Touch ID sensor. If the ribbon connector is damaged, the Mac may appear to be «dead» when the problem is purely mechanical. This is why a Mac that won't turn on always requires a precise diagnosis before considering a costly replacement.
Before moving on to solutions, take 30 seconds to observe what happens (or doesn't happen) when you press the ignition button. These clues will directly guide the diagnosis when a Mac won't turn on.
| Observed symptom | Probable diagnosis |
|---|---|
| No reactionNo sound, no light, no vibration | Empty battery, dead charger or motherboard |
| The fan runs but the screen remains black | Screen, backlight or graphics card layer |
| Start-up sound (bong) but black screen | Display problem, no motherboard |
| MagSafe LED off (MacBook pre-2016) | Faulty charger or dirty MagSafe port |
| LED MagSafe steady green with no load | Battery disconnected or internal connector damaged |
| Loop restart (Apple logo, then shutdown) | macOS corrupted, SSD failing, or RAM defective |
| Light grey screen with flashing «?» | Boot disk not found (SSD down or disconnected) |
Some of these operations may seem obvious, but you'd be surprised at the number of «dead» Macs you get in the workshop that restart after a simple keystroke. Test each solution in order.
It is the most frequently underestimated cause when a Mac won't turn on. Try a other charger if possible (borrow one from a friend or family member or test it in an Apple Retail Store). On USB-C models, inspect the port: compacted dust can prevent contact. A wooden toothpick (never a metal one) can often be used to remove any residue.
If the battery is completely flat, the Mac may take a few hours to recharge. several minutes before reacting. Plug in the charger, wait at least 15 to 20 minutes and then try to switch it on. On certain Apple Silicon models, hold down the Power button for 10 seconds.
The SMC (System Management Controller) manages the power supply, fans and Power button. Resetting the SMC solves a number of problems on Intel Macs, which no longer switch on.
NVRAM stores settings such as boot disk and screen resolution. If this data is corrupted, the Mac may refuse to boot.
Turn on the Mac and immediately hold down Option + Cmd + P + R for 20 seconds. On Macs with the T2 chip (2018-2020), the Apple logo appears and disappears twice.
Le safe mode only loads the essential components of macOS. This is the ideal test to find out if the problem is software when your Mac won't turn on properly.
If the Mac starts up in Safe Mode, the problem is almost certainly software: an incompatible kext, a faulty system extension or a macOS update gone wrong.
If your Apple Silicon Mac doesn't respond to anything, Device Firmware Update (DFU) mode lets you restore the firmware via a second Mac and a USB-C cable. This is the «last software resort» before considering hardware intervention. Apple details the procedure on their support page.
On older MacBook Pro Unibody models (2009-2012), remove the base and physically disconnect the battery for 30 seconds forces a complete hardware reset. Reconnect, close, and try mains power. If the Mac starts up, it's often the battery that's at fault.
The cost depends entirely on the cause identified during the diagnosis. Here is a realistic range based on our rates for a Mac that won't turn on :
| Intervention | Indicative price incl. VAT | Average time |
|---|---|---|
| Full diagnostic | Free | Within 24 hours |
| Battery replacementMacBook Pro, Air, 12″ | 140€ - 280€ | 24h - 48h |
| USB-C or MagSafe charger replacement | 45€ - 95€ | Immediate |
| Motherboard repairMicro-soldering power supply circuit | 190€ - 690€ | 48h - 72h |
| Deoxidation liquid damage | 120€ - 240€ | 48h - 72h |
| Reinstalling macOS | 75€ - 140€ | 24h |
All our prices are all-inclusive: the advertised price includes professional-quality parts, labour and service. 180-day guarantee. If you're not happy with the quote after we've diagnosed your Mac and it won't turn on, you get your machine back without paying a penny.
This is often the first question our customers ask when their Mac stops powering up, and rightly so. The good news is that in the vast majority of cases, the data is intact even if the Mac refuses to boot. The SSD works independently of the motherboard.
In concrete terms, here are the scenarios:
If you've tried the 7 solutions above to no avail and your Mac still won't turn on, it's time to take your machine to a specialist. Here are the signals that should alert you:
In all these cases, avoid attempting any internal manipulations yourself. One wrong move on a cable or connector can turn a €150 repair into a €500 motherboard replacement.
Not necessarily. In our experience, around 90 % of Macs that won't turn on are repairable. The cause is often a flat battery, a faulty charger or a component on the motherboard that can be replaced by micro-soldering. Only a full diagnosis will tell us what's wrong.
Diagnosis is free. The cost then varies according to the cause: from €45 for a simple charger to €690 for a complex motherboard repair. Replacing a battery, the most common cause of a Mac not powering up, costs between €140 and €280 (inc. VAT), including parts and labour.
In most cases, no. The SSD containing your files works independently of failed components. Data can be recovered in around 85 % situations, including when the motherboard is out of order. On recent models with soldered SSDs, the procedure is more technical but still possible.
Connect your Mac to the mains and try to switch it on. If the Mac boots from the mains but not from the battery, it's probably the battery. If nothing happens even when plugged in, it's more likely to be the motherboard power circuit or the charger. A professional diagnosis can confirm this.
This symptom indicates that the motherboard is working but the display is faulty. Connect an external monitor to check. If the image appears on the external screen, the problem is with the LCD panel, the video strip or the backlight. See our page on Mac screen replacement.
No. Apple Silicon Macs no longer have SMC in the traditional sense. The equivalent is to hold down the Power button for 10 seconds, release, wait 5 seconds, then press again. If your Mac still won't turn on after this, DFU mode via a second Mac is the next step.
Yes, our Berchem-Sainte-Agathe workshop operates exclusively by appointment. This means we can guarantee you a dedicated time slot and immediate attention as soon as you arrive. You can also book online or contact us by telephone.
Absolutely. We have worked on all models since 2008, including those considered «obsolete» by Apple. MacBook Pros and iMacs from this period are often repairable at lower cost, thanks to components that are still available and a more accessible design.
It's not necessarily too late. Oxidation progresses over time, but Macs can still be saved weeks after liquid damage. Visit deoxidation by ultrasonic bath removes corrosion and often allows the machine to be restored to its original condition.
Yes, we offer four modes of intervention: workshop in Brussels, home assistance, collection and delivery by courier, and remote troubleshooting for software problems. Physical diagnosis is still recommended when the Mac stops turning on at all.
Over 15 years of Apple expertise in Brussels. Free, no-obligation quote and 180-day guarantee on repairs.
