Found something, but only for one and it is also not accurate.. Any help is appreciated.

$servers=get-content "D:\instances.txt"

foreach($server in $servers)

{ get-wmiobject win32_service -computername $server |

select name,state |

where {

($_.name -like "SQLAGENT*" -or $_.name -like "SQL*AGENT" ) `

-and $_.state -match "Stopped"} | Out-String

}