Powershell - Search for AD Computer

Hi, I have made this script for search for the AD computers, but it doesn´t work.

What should I change?

Thanks.

$startDTM = (Get-Date)

$path = Split-Path -parent "C:\a"



$logdate = Get-Date -Format ddmmyyyy

$userdisableddate = Get-Date


#Define CSV and log file location variables
#they have to be on the same location as the script

$csvfile = $path + "a\User_Info.csv"
$logfile = $path + "a\$logdate.logfile.txt"
$scriptrunrime = $path + "a\scripttime.txt"


#Define variable for a server with AD web services installed

$ADServer = 'noc'



$GetAdminact = Get-Credential

#Import Active Directory Module

Import-Module ActiveDirectory

#Import CSV file and update users in the OU with details from the file
#Create the function script to update the users

Function Update-ADComputers {
$Computers = Import-Csv -Path $csvfile
$OU =   'ou=secretaria,ou=alcaldia,dc=depresion,dc=com','ou=administrativo,ou=alcaldia,dc=depresion,dc=com', 'ou=movilidad,ou=policia,dc=depresion,dc=com'
ForEach ($Computer In $Computers)
{
    $Description = $Computer."Descripcion"
    $Sam = $Computer."Logon Name"
    If ($Sam -And $Description)
    {
     $OU | Foreach { $ComputerInAD = Get-ADComputer -Server $ADServer -Credential $GetAdminact -LDAPFilter "(sAMAccountName=$Sam)" -Searchbase $_  -SearchScope OneLevel

           If ( $ComputerInAD ) {
                             Set-ADComputer -Server $ADServer -Credential $GetAdminact -Identity $Sam -Replace @{Description = $Description}
                             } #If
                              Else
        { #Log error for users that are not in Active Directory or with no Logon name in excel file
        $sam + " Not modified because it doese not exist in AD or LogOn name field is empty on excel file" | Out-File $logfile -Append
}
               } #Foreach

    }

}
}
# Run the function script
Update-ADComputers

$endDTM = (Get-Date)

# Echo Time elapsed
"Elapsed Time: $(($endDTM-$startDTM).totalseconds) seconds""Elapsed Time: $(($endDTM-$startDTM).totalminutes) minutes"