Display test-connection successes and failures in Out-Gridview

I am trying to get a list of servers and the last time they rebooted to show in a table. However, if it doesn't respond to a ping, I just need it to show in the list. I can't seem to figure out how to get it to add to the table after else.

Import-CSV $Downtime | % {
if(Test-Connection $_.server -Quiet -count 1){
    Get-WmiObject Win32_OperatingSystem -ComputerName $_.server | 
    select @{LABEL="Name"; EXPRESSION = {$_.PSComputerName}}, @{LABEL="Last Bootup"; EXPRESSION = {$_.convertToDateTime($_.LastBootupTime)}}
    }
else{@{LABEL="Name"; EXPRESSION = {$_.server}}
    }
} | Out-GridView

I can always save the else results in a text file but this would be more convenient.

You need to make the same object, with the same properties!, in both cases so that PowerShell will understand the association between the two. The follwing example builds a custom hashtable using the if/else and outputs the object for each loop pass.

Import-CSV $Downtime | ForEach-Object {
    $props = @{}
    $server = $_.server
    if(Test-Connection $server -Quiet -count 1){
        $wmi= Get-WmiObject Win32_OperatingSystem -ComputerName $server 
        $props.Name = $wmi.PSComputerName 
        $props."Last Bootup" = $wmi.convertToDateTime($wmi.LastBootupTime)
    }else{
        $props.Name = $server
        $props."Last Bootup" = "Could not contact"
    }
    New-Object -TypeName psobject -Property $props
} | Out-GridView

I used $server as the $_ changes context a couple of time so we wanted to be able to refer to the current row in the CSV we are processing.

I don't know what your PowerShell version is so I will assume 2.0 and create objects that support that.

In both cases an object is created with a Name and Last Bootup property which is populated based on the success of the ping.

As an aside I had a similar question a while ago about created similar object based output.