Start service on remote machine using PowerShell

If you just want remotely use mmc, then start services.msc and connect to remote computer

If you want to use PowerShell, use the following command (atagateway is one example service and serverX is example server name):

Get-Service atagateway -ComputerName serverX | Set-Service -Status running

If you have remote PowerShell enabled, then you can also use this command:

Invoke-Command serverX {Start-Service atagateway}