#Parameters
param(
    [Parameter(Mandatory=$true)]
    [string] $VMId
)

#Check VMId
$ret = get-vm |Where {$_.Id -eq $VMId}
if ($ret -eq $null) {
    Write-Output "VM not found. Aborting."
}

#Get status of Hyper-V VM and start it
$VMName = $ret.Name
$ret = Get-VM -Name $VMName
if(($ret.State -eq "Off") -or ($ret.State -eq "Saved")) {
  Write-Output "Starting VM '$VMName'..."
  Start-VM -Name $VMName
} else {
  Write-Output "VM '$VMName' is already running or in transition. No action taken."
}