3-6AcerAltos 21000 System GuideConnector FunctionCN16 LCD (front panel) connectorCN17 USB connectorCN18 Voltage Regulator Module (VRM) 3 connectorCN19 Slot 2 CPU 3 thermal connectorCN20 Voltage Regulator Module (VRM) 4 connectorCN21 Parallel port (top), VGA port (bottom)CN22 Power cable connectorCN23 Voltage Regulator Module (VRM) 5 connectorCN24 LAN (RJ-45) portCN25 ReservedCN26 Slot 2 socket 4 thermal connectorCN27 Fan connector for Slot 2 socket 3CN28 Power status/control connectorCN29 Voltage Regulator Module (VRM) 6 connectorCN31 & 32 RDM (Remote Diagnostic management) connectorCN33 Fan connector (reserved)CN34 RDM LED connectorCN35 HDD activity indication from Add-on card *CN36 Housing Intrusion Switch connector (left panel)CN37 Fan connector 2CN38 ReservedCN39 FDD connectorCN40 Power button connectorCN41 Narrow SCSI connectorCN42 IDE connector* These connectors (CN35 and CN44) are used for accepting the HDD activity informationfrom the storage adapters. If the storage adapter's information is not passed to the mainboard via these connectors, the activities of the HDD which was connected to the adapterwill not be reflected on LCD Display Module.