A Mac that freezes, will not start or stops responding needs a different next step from one with liquid damage. Start with the symptom and the risk to your data, rather than working through every fix you can find.
The checks below help you decide where to go next. They cannot identify a failed component from a symptom alone.
Before troubleshooting: protect data and identify the Mac
If the Mac is working normally enough to back up safely, protect important files before changing software or settings. If it has suffered liquid exposure, visible damage or suspected battery swelling, stop ordinary troubleshooting and seek advice instead.
Have the model, macOS version and any error message available. Note whether the problem affects one app or the whole machine, and what changed before it began. Avoid erasing, reinstalling or removing unfamiliar files just to see whether the symptom disappears.
Choose the symptom
Slow or unresponsive
Notice when the slowdown occurs. Is it limited to one application, or does basic use remain slow after that application closes? Low available storage is one possibility, not a diagnosis of every slow Mac. Memory pressure and storage capacity are also different things.
Save your work and close applications you no longer need normally. Do not end unfamiliar system processes simply because they appear busy. For a fuller investigation, follow our slow-MacBook guide rather than repeating a second performance checklist here.
Does not finish starting
Record how far startup gets: no visible response, a logo, an error or the login screen. If there is no sign of physical damage, Safe Mode may help investigate software that loads during startup. The method differs between Intel and Apple silicon Macs; use Apple’s model-specific Safe Mode instructions, not a mixed sequence of steps.
If the difficulty began during an update, our macOS update troubleshooting guide is the more focused route. Stop if the suggested next action would erase data you still need.
Will not shut down
Look for an application waiting for a response, such as a prompt to save a document. Save open work and try quitting the application normally before trying to shut down again.
If an app will not respond, Apple explains how to force an app to quit. Force quitting or forcing the Mac off can lose unsaved work, so use that as a fallback rather than a routine shutdown method. The same Apple page covers what to do if a normal restart is unavailable.
Pointer or keyboard problem
First distinguish an app that has stopped responding from an input device that is not working. For an external mouse or keyboard, check its power and connection. Do not assume every keyboard problem needs a Bluetooth reset or a replacement.
A trackpad that behaves differently alongside physical swelling needs professional attention. For other persistent trackpad faults, our trackpad repair and replacement guide explains the decision in more detail.
Liquid exposure: stop and seek advice
If it is safe to do so, turn the Mac off and disconnect power. Do not keep starting or charging it to test whether it has recovered. Do not remove the back cover or battery to drain it, and do not treat a fixed drying period as proof that it is safe to use.
Use our liquid-damage assessment information for the next step. Tell the repairer what was spilled, when it happened and whether the Mac has been powered since. If you have AppleCare, insurance or other cover, check the applicable terms before authorising work rather than assuming a particular outcome.
When professional assessment is the next step
Repeated failures after safe checks, important data that cannot be accessed, or a problem following physical damage justify stopping the trial-and-error process. A list of symptoms and attempted checks helps explain the situation without guessing at a logic-board or software diagnosis.
73inc is an independent repairer. Our Apple-device repair hub sets out the assessment and repair pathways. Share what the Mac does—and what you need to preserve—so the proposed work can be considered against that problem.
