Direct answer
For the Apple MacBook Pro 14-inch (M4 family), output routing, mute/volume, one app, Bluetooth/dock and hardware should be separated. First, select built-in speakers and play a system test sound.
What this covers
- Apple MacBook Pro 14-inch (M4 family) (2024 M4/M4 Pro/M4 Max 14-inch)
- Apple Mac family; processor generation, ports, external-display limits and macOS eligibility vary.
- The specific fault this record addresses: has no sound or distorted audio
What it does not cover
- ×The same symptom on a different Apple product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
The wrong output device is selected
What separates it Silence from the speakers with a monitor, dock, headset or virtual audio device selected as the output.
How to confirm Check the output device explicitly. Connecting an HDMI monitor commonly switches audio to the monitor's own speakers, which may not exist or may be turned down.
- 2
An application has its own volume or output setting
What separates it One application is silent while others play normally.
How to confirm Both Windows and macOS allow per-application volume and output routing, and a single app can be muted independently of the system.
- 3
Bluetooth headphones are still connected
What separates it No sound from the speakers, with headphones powered on somewhere nearby.
How to confirm The machine will keep routing audio to them silently. Disconnect them explicitly.
- 4
The audio device has switched to a communications profile
What separates it Bluetooth headphones sound thin and low quality, usually after a call application started.
How to confirm Bluetooth headsets switch to a low-bandwidth profile when a microphone is in use. Quitting the call application restores full-quality playback.
- 5
The headphone jack is stuck in the headphone state
What separates it No speaker output after headphones were unplugged, with the system still reporting headphones connected.
How to confirm Insert and remove headphones a few times. A stuck switch inside the jack is a real and common mechanical fault.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- Which output device the system currently has selected.
- Whether the silence affects everything or one application.
- Whether any Bluetooth audio device is connected.
- Whether an HDMI or USB-C display or dock was connected recently.
Check and set the output device explicitly
ReversibleConnecting a monitor or dock commonly reroutes audio to speakers that may not exist.
Check per-application volume and routing
ReversibleA single application can be muted or routed elsewhere independently of the system volume.
Disconnect any Bluetooth audio device
ReversibleThe machine will keep sending audio to connected headphones silently.
Quit call applications to restore full-quality Bluetooth playback
ReversibleA headset switches to a low-bandwidth communications profile whenever its microphone is in use.
Insert and remove headphones a few times if the jack seems stuck
ReversibleA stuck switch inside the jack leaves the system believing headphones are still connected.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- 2024 M4/M4 Pro/M4 Max 14-inch. Apple Mac family; processor generation, ports, external-display limits and macOS eligibility vary.
- Platform — macOS on Apple Silicon (M4 family)
- A 14-inch MacBook Pro with an M4-family chip, running macOS. Soldered unified memory; native arm64 apps direct, Intel via Rosetta 2; no native x86 Windows. Actively cooled (fans), so it sustains heavy loads far better than the Air.
- Pro features
- A brighter mini-LED ProMotion (120 Hz) display, more ports (HDMI, SD, Thunderbolt), and MagSafe. It drives multiple external displays (more than the base Air).
- Fans under load are normal
- The fans spin up audibly during heavy work (video, compiling, gaming) — that is the active cooling doing its job so it does not throttle, not a fault.
- Power path
- Internal or removable battery. Every capability that costs current — night vision, higher stream quality, longer recordings, frequent events — is paid for in runtime, so a change in behaviour after a settings change is usually a power consequence rather than a fault. Cold weather reduces usable capacity sharply.
- Symptom boundary
- This record covers Apple MacBook Pro 14-inch (M4 family) when it has no sound or distorted audio. A different symptom on the same hardware, or this symptom on a different Apple product line, has its own record with its own causes and its own cited source.
Stop boundary
When this stops being a self-service repair
Continuing past any one of these costs more than the repair saves — in safety, in warranty, or in evidence a technician needs.
- !Stop for distortion accompanied by heat, or any burning smell from the speaker area.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Where the manufacturer's article stops. Apple Support publishes this as "If the internal speakers on your Mac aren't working". Apple's Mac audio article. Probed 2026-08-23: title-verified. What that article does not carry is the model boundary — it is written for a product line, and 2024 M4/M4 Pro/M4 Max 14-inch is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
The fans on my MacBook Pro M4 get loud during heavy tasks.+
That is normal and desirable — unlike the fanless Air, the MacBook Pro has fans that spin up under heavy load (video export, compiling, gaming) specifically so the chip can stay at full speed without throttling. Audible fans during intense work are the cooling doing its job. If they run loud at idle, check Activity Monitor for a runaway process, and make sure the vents are not blocked. Sustained performance is exactly what the Pro's cooling buys over the Air.
My laptop went silent after I plugged in a monitor.+
Connecting an HDMI or USB-C display commonly switches the system's audio output to that display's own speakers — which may not exist, or may be turned all the way down. Open the sound output settings and select the laptop's own speakers explicitly.
My Bluetooth headphones sound terrible on calls.+
That is the Bluetooth communications profile rather than a fault. When a microphone is in use, the headset switches to a much lower-bandwidth two-way mode, and audio quality drops noticeably. It returns to full quality once the call application releases the microphone — quitting it entirely, not just ending the call, is sometimes needed.
Does this answer apply to every Apple model?+
No. It is scoped to 2024 M4/M4 Pro/M4 Max 14-inch. Apple Mac family; processor generation, ports, external-display limits and macOS eligibility vary.
What should I record before troubleshooting no sound or audio?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing no sound, audio. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Stop for heat, smoke, liquid or severe distortion with hardware damage.
Answer for the exact device and software version shown above.