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I went to bed with my 2017 MacBook Air rendering a movie in iMovie. Next morning the Mac was still on with the movie fully rendered, but the screen was still on and the fan was running. Now I have a problem with the SMC, namely, no audio output, fan runs continuously and the mag safe charger doesn’t light, although I know it is charging. I’ve reset the SMC numerous times. Problem persists.
Question. Would a fresh clean install help?
Try running the Apple Diagnostics.
Run Disk Utility First Aid on the SSD. Even bettery run First Aid on the "Container" as well. To see the "Container" within Disk Utility you will first need to click on "View" within Disk Utility and selecting "Show All Devices" before the physical SSD and the "Container" will appear on the left pane of Disk Utility. Even if First Aid reports everything as "Ok" make sure to click on "Details" and examine the details for any unfixed errors. If there are unfixed errors, then those unfixed errors may be causing the problem. The only way to fix the file system is to back everything up and erase the whole physical SSD before restoring from a backup.
Try booting into Safe Mode. If Safe Mode works, then you most likely have a software issue. Run EtreCheck and post the report here using the "Additional Text" icon which looks like a piece of paper.
If you still have issues try creating a new user account and logging into the new user account to see how it works. If a different user works, then you have a preference file issue with your normal user account.
Try running the Apple Diagnostics.
Run Disk Utility First Aid on the SSD. Even bettery run First Aid on the "Container" as well. To see the "Container" within Disk Utility you will first need to click on "View" within Disk Utility and selecting "Show All Devices" before the physical SSD and the "Container" will appear on the left pane of Disk Utility. Even if First Aid reports everything as "Ok" make sure to click on "Details" and examine the details for any unfixed errors. If there are unfixed errors, then those unfixed errors may be causing the problem. The only way to fix the file system is to back everything up and erase the whole physical SSD before restoring from a backup.
Try booting into Safe Mode. If Safe Mode works, then you most likely have a software issue. Run EtreCheck and post the report here using the "Additional Text" icon which looks like a piece of paper.
If you still have issues try creating a new user account and logging into the new user account to see how it works. If a different user works, then you have a preference file issue with your normal user account.
Thanks. Great suggestions. I have resolved the issue. I kept on trying to reset the SMC by the 3 buttons (left side) and power button. I tried various combinations of time. Hold for 20, release, hold for 10 then shut off. I noticed that my symptoms would change. (Originally fan would gradually speed up during the boot process, then run full speed. I had no audio output. And no lights on the mag safe adapter). All signs of the SMC. As I was resetting. The fan would power on full speed at startup, not gradual. I lost the backlighting of the keyboard. Finally I got back to the original symptoms. Then I performed an old school repair technique. I shut it down closed the lid, turned it over, and with the heel of my hand I rapped on the bottom 5 or 6 times.
when I powered it back on the Mac “bong” rang out. All better. Everything is working as it should.
The I/O Cable connecting the I/O Board and the Logic Board may be loose (it is the most likely cable to become loose). It is also the 2nd most likely cable to get liquid damage on the connectors (after the Trackpad IPD Flex Cable). I don't know of anything else except for the Display Cable which would be affected by rapping on the laptop.
MacBook Air 2017 SMC
