A black screen with a white spinning wheel means iOS is working on itself ... Tenorshare ReiBoot is an iPhone recovery tool that can repair problems in iOS stops it from booting and other issues.

Then, take your MacBook to an Apple Store or repair shop to install a new hard ... processes and allows you to determine if your spinning wheel is the result of a new application causing problems ...

If you're new to the Mac ecosystem (maybe you've recently made the switch from Windows), nobody would blame you for mistaking the friendly-looking rainbow-colored spinning wheel for something benign.