Question : 2GB of RAM laptop only recognizing 1GB

My brother-n-law has a Toshiba laptop with windows vista, he had 512MB of memory installed.  he bought 1GB of RAM to put in there with the 512, after he installed it, the computer would only show the 1GB installed, it wouldn't show the 512, so he took out the 512 and bought another 1GB of RAM....So now he has 2GB but the computer still just shows 1 installed.  He has tried both slots one at a time with the same result.  Does anyone have any ideas what might be wrong, or that we are doing wrong?  Thanks

Answer : 2GB of RAM laptop only recognizing 1GB

So using the code from that link:

[void][Reflection.Assembly]::LoadFrom("C:\IndyNet-Daily-20051007\Indy.Sockets.dll")
$ftp = new-object Indy.Sockets.FTP
$ftp.Disconnect()
$ftp.Host = $ftphost
$ftp.Username = $username
$ftp.Password = $password
$ftp.Connect()
$ftp.Passive=$true;

wc = new-object System.Net.WebClient
$wc.Credentials = New-Object System.Net.NetworkCredential($strFtpUser,$strFtpPass)
$ls = new-object System.Collections.Specialized.StringCollection;
$ftp.List($ls, "", $true);
foreach($file in $ls){
   "Downloading {0} into {1}.." -f $sourceFileName, $targetDir;
    $ftp.Get($sourceFileName, ($targetDir + $sourceFileName), $true, $false);
}