WIP-ValidateSources.ps1

#Validate sources
Write-Host "Validating sources...`n"
$Keep = @()
ForEach ($Source in $Sources)
{   Write-host "$Source..." -NoNewline
    If (-not (Get-WmiObject "Win32_ComputerSystem" -ComputerName $Source -ErrorAction SilentlyContinue))
    {   #Are you sure?
        Start-Sleep -Milliseconds 500
        If (-not (Get-WmiObject "Win32_ComputerSystem" -ComputerName $Source -ErrorAction SilentlyContinue))
        {   Write-Host "BAD" -ForegroundColor Red
            Write-Warning "$($Error[0])"
            Write-Warning "Removing $Source from Source list"
        }
        Else 
        {   Write-Host "OK"
            $Keep += $Source
        }
    }
    Else 
    {   Write-Host "OK"
        $Keep += $Source
    }
}