My MacBook Pro doesn't start. I turn it on, it goes loads for a bit, then goes black after displaying a progress bar below the spinny loading thing(not the beachball, the other one) which goes to one pixel before giving up . Help please.how do i get it to start and run normally?
Try a Power Cycle
Performing a power cycle could be the solution you're looking for if you're Mac is frozen. By pulling the plug, you'll force it to restart, and the solution could be as easy as that. If you have a modern Mac that doesn't come with a removable battery, press the power button for ten seconds.
This will cut the power if you Mac has power. If your Mac does have a removable battery, turn it off and take out the battery. Leave the battery out for about 10 seconds or so.
Reset The PRAM & SMC
SMC stands for System Management Controller. It's what manages your Mac's power, lights, fans, display and more. If you Have a Mac without a removable battery you can try the following steps:
- Turn off your Mac
- Plug in the MagSafe to a power source of also making sure it's connected to your Mac as well.
- Using the built-in keyboard, press the Shift + Control +option keys and the power button simultaneously.
- Let go of all the buttons at the same time
- Turn on your Mac as usual
If your Mac does have a removable battery then try:
- Unplug the MagSafe power adapter from your computer and remove the battery
- Long-press the power button for five seconds and let go
- Reconnect the MagSafe power adapter and the battery
- Turn on your Mac as usual
To reset the PRAM, turn on your Mac and as soon as you hear the chime at startup hold down the Command + Option + P + R keys. Keep pressing these keys until your Mac restarts a second time. If you have a modern Mac, you could also reset the NVRAM, which is done the same way as PRAM.
https://howtosimply.com/mac-wont-start-try-useful-tips-1932/