##Load server list. A text file containing one server name per line.
$serverList = Get-Content -Path C:\temp\server.txt
$logfile = "C:\temp\logfile.txt"
Add-Content $logfile -value "..................................................."
Add-Content $logfile -value "New log file $(Get-Date)"
$c = Get-Credential
##A loop that is run for each server foreach ($server in $serverList)
{
    ##check whether the server answer via ping.
    if (Test-Connection -ComputerName $server -Quiet -Count 1)
    {
    ##If the server can be reached via ping, then:
      Add-Content $logfile -value "...Server $($server)..."
      $computerInfo = Get-WMIObject Win32_ComputerSystem -computerName $server -Credential $c
      $osInfo = Get-WMIObject Win32_OperatingSystem -computername $server -Credential $c
      $bootTime = [string]$osInfo.ConvertToDateTime ($osInfo.LastBootUpTime)
      #If the manufacturer is Microsoft or VMWare
      if($computerInfo.Manufacturer -eq "Microsoft Corporation" -and $computerInfo.Model -eq "Virtual Machine")
      {
        $type = "Hyper-V Virtual Machine"
      }
      elseif($computerInfo.Manufacturer -eq "VMware, Inc." -and $computerInfo.Model -eq "VMware Virtual Platform")
      {
        $type = "VMWare Virtual Machine"
      }
      else
      {
        $type = "physical machine"
      }
      ##Computer Info
      Add-Content $logfile -value "Member of $($computerInfo.Domain). Made by $($computerInfo.Manufacturer)."
      Add-Content $logfile -value "It is a $($type)."
      Add-Content $logfile -value "RAM: $($computer Info.TotalPhysicalMemory/1024/1024) MByte"
      ##OSInfo
      Add-Content $logfile -value "Running on $($osInfo.Caption), build $($osInfo.BuildNumber) - with $($osInfo.OSArchitecture)"
      Add-Content $logfile -value "Installed on $($osInfo.ConvertToDateTime($osInfo.Install Date))"
      Add-Content $logfile -value "Registered user: $($osInfo.RegisteredUser)"
     Add-Content $logfile -value "Last started $($bootTime)"
    }
    else
   {
      Write host "The server $($server) cannot be reached. We proceed with the next..."
   }
}