# Setup trap to catch exceptions
trap [Exception]
{
	write-error $("TRAPPED: " + $_.Exception.Message); 
}
 
# read computers from text file
$computers = Get-Content C:\Computers.txt;
$start = $true;
 
# Setup the Service array with the service names we want to check are running
$serviceArray = 'SQLAgent$SQL2005', 'MSSQL$SQL2005';
 
# Powershell knows it's an array so working with it is simple
foreach($computer in $computers)
{
	Write-Host "Checking $computer";
	$objWMIService = Get-WmiObject -Class win32_service -computer $computer
 
	foreach($service in $objWMIService)
	{	
		# Check each service specicfied in the $serviceArray
		foreach($srv in $serviceArray)
		{
			if($service.name -eq $srv)
			{
				Write-Host "$srv is present on $computer.";
				if($service.state -eq "running")
				{
					Write-Host "$srv is running on $computer";
				}
				else
				{
					Write-Host "$srv is not running on $computer";
					# If $start is true the script will attempt to start the service if it is stopped
					if($start -eq $true)
					{
						# Attempt to start the current service on the current computer
						$serviceInstance = (Get-WmiObject -computer $computer Win32_Service -Filter "Name='$srv'");
						$name = $serviceInstance.Name;
						Write-Host "Attempting to start $name  on $computer."
						$serviceInstance.StartService() | Out-Null;
						# Refresh the object instance so we get new data
						$serviceInstance = (Get-WmiObject -computer $computer Win32_Service -Filter "Name='$srv'");
						$state = $serviceInstance.State;
						Write-Host "$name is ""$state"" on  $computer.";		
					}
				}
			}
		}
	}
}