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# start(options:completionHandler:)

Starts the VM with the options and a completion handler you provide.

```
func start(options: VZVirtualMachineStartOptions, completionHandler: @escaping ((any Error)?) -> Void)
```

## Parameters

`options`

A [`VZVirtualMachineStartOptions`](/documentation/Virtualization/VZVirtualMachineStartOptions) object that describes controlling startup behavior of a VM using [`VZMacOSBootLoader`](/documentation/Virtualization/VZMacOSBootLoader).

`completionHandler`

The block to call with the results of the startup attempt. This block has no return value and has one <doc://com.apple.documentation/documentation/Foundation/NSError> object as its parameter:

- error: A result type that contains an error object when the VM fails to start.

## See Also

[`VZMacOSVirtualMachineStartOptions`](/documentation/Virtualization/VZMacOSVirtualMachineStartOptions)

A class that describes start options for macOS VMs.


---

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