Trouver pourquoi un PC a redemarrer

Cette fonction sert a trouver pourquoi une machine a rebooté :
IN : MachineName

# Return all events about shutdown
#
# http://gallery.technet.microsoft.com/scriptcenter/496332b0-0e2d-4875-bcae-db8384512812

function Get-ShutdownReason { 
#Requires -Version 2.0             
[CmdletBinding()]             
 Param              
   (                        
    [Parameter(Mandatory=$true, 
               Position=1,                           
               ValueFromPipeline=$false,             
               ValueFromPipelineByPropertyName=$false)]             
    [Array]$Computer, 
    [Int]$Count = 4 
   )#End Param 
 
Begin             
{             
 Write-Host "`n Checking logs . . . " 
 $i = 0             
}#Begin           
Process             
{ 
 
$Computer | % { 
Get-EventLog -ComputerName $_ -LogName system -Source USER32 -Newest $Count | select TimeWritten, Username, Message # | fl 
} 
 
}#Process 
End 
{ 
 
}#End 
 
}
Get-ShutdownReason $args[0]