Summary: I purchased the P3005X as a replacement for an HP4050, (have three of them in our offices, they are great printers). Right after this printer initialized, I began receiving various error messages (mainly 49.4C02 - printer error). Then a memory test failure, ("replace DIMM 01"). Went online with HP support, did various trouble-shooting (including re-seating the DIMM). Long story short: hardware failure.
Summary: I have been extremely pleased with HP printers for as long as I've been computing (almost 25 years!), however I bought an HP Laserjet P3005x in late 2007 and have had no end of problems, the most significant being the faulty formatter board, which is the brain of the printer. I have learned that this part is defective in a large number of these particular printers, and that there is an HP service note on units within a certain serial number range.