Can we do script to auto restart for Services if the VM Agent status is not ready using Powershell ?

Hi everyone, 

This is my current scenario:  
VM status is "Running",  VMAgent is "Not Ready",Windows Azure Guest Agent  service is "Stopped".

I will manually start Windows Azure Guest Agent whenever my VMAgent is not ready. 

So is there any script I can write using Powershell to automatically Start the service whenever VMAgent is not ready ?