powershell startup script sometimes creates blank file

[sted]

i have a powershell script that i have set to run on every pc at bootup. In testing it works fine (needs powershell 4 for somereason but that i can live with) but every now and again it seems to end up creating a blank file that then nothing else ever updates. Can anyone see why it all looks ok to me (though granted im new to powershell) I suspect its something really dumb that i just cant see

 

# system info ps v1

#check ps version if <4 exit
$psver1=get-host
$psver2=$psver1.version.major
if ($psver2 -lt 4)
{
   exit
}

#locate output file & define default values
$filepath="\\server\inventory2$\outputfile.csv"
$dop="-"
$warantyyears="-"
$warantyend="-"
$location = "-"
$file=""
$csvout=""
$arrayloc=""
$newline=""

#import existing file if it exists

if(test-path -path $filepath)
{
$fileexists="true"
$file = Import-Csv $filepath 
}

if(!(test-path -path $filepath))
{
$fileexists="false"
}

# get mac address active cards (tested on multinics)
$mac= Get-WmiObject Win32_NetworkAdapterConfiguration -Filter 'ipenabled = "true"' | Select macAddress
if ($mac.count) {$mac3=$mac.macaddress[0] + " : " + $mac.macaddress[1]} else {$mac3=$mac.macaddress}

# get processor and pc name
$procinfo = Get-WmiObject Win32_Processor
$cpuname=$procinfo.Name
$pcname=$procinfo.SystemName

# get memory info/model/make
$pcinfo = Get-WmiObject Win32_ComputerSystem 
$maker=$pcinfo.Manufacturer
$model=$pcinfo.Model
$ram=$pcinfo.TotalPhysicalMemory/1024/1024/1024
$ram = "{0:N1}" -f $ram

#get serial no
$serial=Get-WmiObject Win32_BIOS
$serial2=$serial.SerialNumber

#hdd size and free in gb rounded to nearest whole no
$hdddata=Get-WmiObject Win32_LogicalDisk -Filter 'deviceid="c:"'
$freespace=$hdddata.FreeSpace/1024/1024/1024
$freespace = "{0:N0}" -f $freespace
$totalspace=$hdddata.size/1024/1024/1024
$totalspace = "{0:N0}" -f $totalspace

# get windows version
$os=Get-WmiObject Win32_OperatingSystem | select caption
$os2=$os.caption

#date-time
$now= Get-Date
$now2 = $now.date

#create csv data if no existing file
if ($fileexists -eq "false")
{
   #echo "new file created"
   $csvout = New-Object psobject
   $csvout | add-member NoteProperty Macaddress $mac3
   $csvout | add-member NoteProperty PCName $pcname
   $csvout | add-member NoteProperty Manufacturer $Maker
   $csvout | add-member NoteProperty "PC Model" $model
   $csvout | add-member NoteProperty Processor $CPUName
   $csvout | add-member NoteProperty Memory $ram
   $csvout | add-member NoteProperty "HDD Size" $totalspace
   $csvout | add-member NoteProperty "HDD Free" $freespace
   $csvout | add-member NoteProperty "Serial No" $serial2
   $csvout | add-member NoteProperty "Windows Version" $os2
$csvout | add-member NoteProperty "Date Collected" $now2
   $csvout | add-member NoteProperty "Date purchased" $dop
   $csvout | add-member NoteProperty "Warranty years" $warantyyears
   $csvout | add-member NoteProperty "Warranty Expiration" $warantyend
   $csvout | add-member NoteProperty "Location" $location

   $csvout | export-csv $filepath -notypeinformation #-Append
}

if($fileexists -eq "true")
   {
   $arrayloc=[array]::indexof($file.pcname, $pcname)
   if (!($arrayloc -eq -1))
       {
       #echo "replacing data"
       #$file[$arrayloc] |Format-Table
       $file[$arrayloc].macaddress=$mac3
       $file[$arrayloc].pcname= $pcname
       $file[$arrayloc].Manufacturer=$maker
       $file[$arrayloc]."pc model"=$model
       $file[$arrayloc].processor=$cpuname
       $file[$arrayloc].memory=$ram
       $file[$arrayloc]."hdd size" = $totalspace
       $file[$arrayloc]."hdd free" = $freespace
       $file[$arrayloc]."serial no" = $serial2
       $file[$arrayloc]."Windows Version" = $os2
	$file[$arrayloc]."Date Collected" = $now2
       $file | export-csv $filepath -notypeinformation
       }
   if ($arrayloc -eq -1)
       {
       #echo "adding new line"
       $csvout = New-Object psobject
       $csvout | add-member NoteProperty Macaddress $mac3
       $csvout | add-member NoteProperty PCName $pcname
       $csvout | add-member NoteProperty Manufacturer $Maker
       $csvout | add-member NoteProperty "PC Model" $model
       $csvout | add-member NoteProperty Processor $CPUName
       $csvout | add-member NoteProperty Memory $ram
       $csvout | add-member NoteProperty "HDD Size" $totalspace
       $csvout | add-member NoteProperty "HDD Free" $freespace
       $csvout | add-member NoteProperty "Serial No" $serial2
       $csvout | add-member NoteProperty "Windows Version" $os2
	$csvout | add-member NoteProperty "Date Collected" $now2
       $csvout | add-member NoteProperty "Date purchased" $dop
       $csvout | add-member NoteProperty "Warranty years" $warantyyears
       $csvout | add-member NoteProperty "Warranty Expiration" $warantyend
       $csvout | add-member NoteProperty "Location" $location

       $csvout | export-csv $filepath -notypeinformation -Append    
       }
   }