If the HP Universal print driver cannot automatically retrieve a printer configuration (say SNMP is blocked on the network or disabled on the device) it defaults to monochrome printing (UPD version 5.0 and newer). This can also lead to long pauses while trying to open the printer properties, as it presumably times out while trying to retrieve the data. On the Device Settings tab, click Device Type: Auto Detect to display the drop-down list and then select Color (and also check the duplex setting).