Get-DbaStartupParameter: Fix multiple issues (#10208)

Author: andreasjordan

public/Get-DbaStartupParameter.ps1

@@ -94,19 +94,14 @@ function Get-DbaStartupParameter {
                 $instanceName = $instance.InstanceName
                 $ogInstance = $instance.FullSmoName
 
-                $computerName = (Resolve-DbaNetworkName -ComputerName $computerName).FullComputerName
-
-
-                if ($instanceName.Length -eq 0) { $instanceName = "MSSQLSERVER" }
-
-                $displayName = "SQL Server ($instanceName)"
-
                 $scriptBlock = {
                     $computerName = $args[0]
-                    $displayName = $args[1]
-                    $Simple = $args[2]
+                    $instanceName = $args[1]
+                    $ogInstance = $args[2]
+                    $Simple = $args[3]
 
-                    $wmisvc = $wmi.Services | Where-Object DisplayName -eq $displayName
+                    $wmisvc = $wmi.Services | Where-Object DisplayName -eq "SQL Server ($instanceName)"
+                    if (-not $wmisvc) { return }
 
                     $params = $wmisvc.StartupParameters -split ';'
 
@@ -208,10 +203,10 @@ function Get-DbaStartupParameter {
 
                 # This command is in the internal function
                 # It's sorta like Invoke-Command.
-                if ($credential) {
-                    Invoke-ManagedComputerCommand -Server $computerName -Credential $credential -ScriptBlock $scriptBlock -ArgumentList $computerName, $displayName, $Simple
+                if ($Credential) {
+                    Invoke-ManagedComputerCommand -Server $computerName -Credential $Credential -ScriptBlock $scriptBlock -ArgumentList $computerName, $instanceName, $ogInstance, $Simple
                 } else {
-                    Invoke-ManagedComputerCommand -Server $computerName -ScriptBlock $scriptBlock -ArgumentList $computerName, $displayName, $Simple
+                    Invoke-ManagedComputerCommand -Server $computerName -ScriptBlock $scriptBlock -ArgumentList $computerName, $instanceName, $ogInstance, $Simple
                 }
             } catch {
                 Stop-Function -Message "$instance failed." -ErrorRecord $_ -Continue -Target $instance