In reply to:

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Are these printers going to a queue on the server or are you printing to them directly? Have you tried setting them up to print directly to the printer (straight to the HP Jetdirect server orw whatever) and not go through the queue or vice versa? I have also seen the print dialog hang for minutes when the printer is a network queue and the print server machine is down. Never have seen this when you set the machines up to print directly to the networked printer.

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They are going to a queue on the server. But I am pretty sure that is not the problem. Other clients (Windows XP and Windows 95 and 98 work fine). I formatted one of these computers and reinstalled everything from scratch. I ten installed SP4 and the same problem appears on that computer. I am starting to wonder if this is somehow related to an incompatibility in the hardware to SP4. All of these Windows 2000 machines are identical IBM units. Maybe I'll have a look at their website.

/me goes surfing