Mac Sierra non si avvia - SmartBattery: tipo di polling finito 4

Ho riscontrato lo stesso problema e ho trovato la soluzione qui: link

Citazioni:

Now that I look a bit more closely, the issue may be a corrupt .kext file as I get two busy timeout [x] (60s) kextd wait(1): messages with corrupt garbage characters listed just at the start of the infinite SmartBattery messages.

Not convinced the battery is really the issue as the machine will boot quite happily when using another boot disk or USB drive and the SmartBattery checks in those boot logs are really no different. To me it looks like the boot process has hung at the kextd and the endless SmartBattery messages are the OS just passing the time waiting for a response to the kextd daemon its never going to get.

Your (and my) problem is because auf a KEXT file which is not compatible to 10.12.2 - the software isn't clever enough to ignore this, so you have to do it yourself. There are some ways. I made it this way:
Start into Recovery HD, Open Terminal, write down:

mkdir /Volumes/"Macintosh HD"/kextbackup
cd /Volumes/"Macintosh HD"/System/Library/Extensions

look for .kext files which are not part of the normal system

mv KEXTNAME.kext /Volumes/"Macintosh HD"/kextbackup/

I removed the following and after this the system booted again.

Belcarra.USBLAN_netpart.kext
Belcarra.USBLAN_usbpart.kext
HuaweiDataCardDriver.kext
JMicronATA.kext
RemoteControl.USBLAN_usbpart.kext
UsbEthernetGadget.kext
USBExpressCardCantWake_Huawei.kext
vecLib.kext

Of course everybody has his own not compatible kext files in this folder. Actually you can't do anything wrong by just moving them to another place... But I would recommend you not to move any of the APPLE*.kext files and the IO*.kext files. Other files with not that normal names, I would move and try to start.... At the moment my Sound is not working.. So I moved one kext too much, but anyway... I can write this.. in Safari on my Macbook Pro Retina....

EDIT: Questo ha funzionato per me. Nota che non ho ancora ricevuto alcun suono, ma lo ho ripristinato dopo aver spostato "vecLib.kext" (tornando di nuovo alla modalità di ripristino e spostandolo dalla cartella kextbackup), quindi cerca di mantenerlo attivo dall'inizio:)

Qualcuno nel nostro ufficio ha avuto questo problema esattamente stamattina. Riuscito a farlo funzionare nuovamente ripristinando SMC (System Management Controller).

Spero che questo aiuti qualcun altro nella stessa situazione.

Per ripristinare la SMC.

If the battery is nonremovable

1. Shut down the Mac.
2. Plug in the MagSafe or USB-C power adapter to a power source and to your Mac.
3. Using the built-in keyboard, press Shift-Control-Option on the left side of the keyboard, then press the power button at the same time.
4. Release all keys, then press the power button again to turn on your Mac

If the battery is removable

1. Shut down the Mac.
2. Disconnect the MagSafe power adapter from the Mac.
3. Remove the battery. (Learn about removing the battery in MacBook and MacBook Pro computers.)
4. Press and hold the power button for 5 seconds. Reconnect the battery and MagSafe power adapter. Press the power button to turn on the Mac. The LED on MagSafe power adapters might change states or temporarily turn off when you reset the SMC.

(SMC instructions from https://support.apple.com/en-gb/HT201295)

Ripristina dal backup solo con app e dati utente risolvono il problema.