Query error, too few parameters

[avtuvy]

Access 2003 VBA

My project includes a form with a combo box, text from the combo box is an input to a query. when I run the query in design view it prompts me for the parameter name and the results are correct, when I run it from the form using the input from the combo box I get error 3061, too few parameters. I added a watch for qdf and I do see that the parameter from the combo box is entered.
Please help

my VBA code

Dim qdf As DAO.QueryDef
    Set qdf = db.QueryDefs("qrySerialNumber")
    qdf.Parameters("ServerName2") = "'" & Forms![frmServers_1]![cmbServerName] & "'"
    
    Set rs = db.OpenRecordset("qrySerialNumber", dbOpenForwardOnly)

Query

SELECT dbo_TBL_ServerInformation.SerialNumber, dbo_TBL_ServerInformation.DiskSize, dbo_TBL_ServerInformation.WarrantyExpiration
FROM dbo_TBL_ServerInformation INNER JOIN dbo_TBL_Location ON dbo_TBL_ServerInformation.LocationID=dbo_TBL_Location.LocationID
WHERE (((dbo_TBL_ServerInformation.ServerName)=ServerName2));