[ADSI] Question

We have recently added VDI to our arsenal.  I need to modify our build scripts to modify these.  I swore this was working, and now it is not, but here is what is happening.  I sure could use some assistance.  

VDI are created and automatically put on the Domain in the ComputersOU, where physical PC's and laptops are not.  I used 

Get-WMIObject win32_computersystem.pcsystemtype and Get-WMIObject win32_computersystem.model to determine if the equipment being built is a physical laptop or VDI.  If it is a CDI, I have it run this command with the goal to move it from the ComputersOU to the ComputersWB- VDI OU:

## Determine if PC is a VDI based on Model
If ($model -like "VMware Virtual Platform")
    { 
     ## Move PC from ComputersOU to ComputersWB\VDI OU based on Model
     $AD = [ADSI]''   
     # Setup the search criteria
     $ADSearch = New-Object System.DirectoryServices.DirectorySearcher    
     $ADSearch.SearchRoot = $AD    
     $ADSearch.Filter = "(objectclass=computer)"
     $Results = $ADSearch.FindAll() | Where-Object {$_.properties.item("cn") -like $CN}
     # Get the DN of the object
     $ComputerDN = $Results.Properties.Item("DistinguishedName")
     # Connect to the computer object
     $Object = [ADSI]"LDAP://$ComputerDN"
     # Specify the target OU
     $TargetOU = "OU=VDI,OU=ComputersWB,DC=BLAIRNET,DC=NET"
     $TargetOU="LDAP://$targetOU"
     # Move the object to the target OU
     $Object.psbase.MoveTo($TargetOU)
    }  

I swore this was working.  I really did, but when I ran it again on a new VDI, it fails miserably.  Doing some troubleshooting, it fails almost immediately and i don't know why.  

When I run the line $AD = [ADSI]'', I get the following error:

format-default : The following exception occurred while retrieving member "distinguishedName": "The specified domain either does not exist or could not be 
contacted.
"
    + CategoryInfo          : NotSpecified: (:) [format-default], ExtendedTypeSystemException
    + FullyQualifiedErrorId : CatchFromBaseGetMember,Microsoft.PowerShell.Commands.FormatDefaultCommand

Looking for some guidance on how to move this VDI automatically to another OU using ADSI commands or to figure out why I am getting this error.  Maybe I was logged in as myself when it worked, but I swore it worked as it was supposed to logging in a a local user - not a domain user.  

Any help or thoughts appreciated.  

Matt

Matt Dillon