I tried to reset the laptop and it gave an error.

liya230 wrote:

I clicked the “Reset (erase?) Mac”, it started to download and then just suddenly an exclamation point sign with “apple.com/support -2106F” appeared. And now I can’t do anything, not even switching it off.

re: < -2106F >

If your download speed is suspect get on a faster Network

You can always force quit a shutdown by holding the power button/TouchID for ~6-10 sec.

Force Shut down your Mac.

Log out, sleep, wake, restart or shut down your Mac

Shut down or restart your Mac - Apple Support

Reboot and see where this leaves you.

If necessary ref: Revive or restore an Intel-based Mac using Apple Configurator - Apple Support

In Internet Recovery, these low negative thousands error messages indicate that your provided Wi-Fi Network is inadequate in some fashion, and cannot be used (for this purpose) in its current state.

Common problems include:

Hidden Network-name

required use of a proxy server to get Internet access

required use of a login page to get Internet access

Use of a login server or certificate to get Internet access

Use of PPPoE in the Mac to get Internet access (typically only applies to DSL)

Use of Fixed IP address rather than good old DHCP

Variance of the time by more than five minutes

Failure of Router to provide workable DNS server addresses, or providing 0.0.0.0 [may produce -2002f]

If you have an Ethernet port, you may in some cases be able to move your Mac close to the Router and connect to the Router using Ethernet.

The higher the number, the more obscure the problem.

What year Mac?

This might help, but without the year and other details it's all just guessing: If you can't start up from macOS Recovery - Apple Support

Possibly Related post: https://discussions.apple.com/thread/8402019