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This occurs randomly and can not be predicted. I have already 3 pages like that collected over the last 3 months. This happens by itself. The user reads a webpage (no clicks for 2 minutes) and suddenly the printer starts printing blank page with just 1 line of 'GGG' text.

This is at work and it is a network HP laser printer (basic model) (HP LaserJet P4015n). There is an enterprise print server. Print jobs (by the user) are submitted to the printer by the print server.

How can I tell if it is my PC or some other network PC ? How can I examine the printer queue to find out the source of this printing "virus"?

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The answer depends on your setup. Do you have centralized print server, or computers send jobs directly to the printer? –  Nikolay Aug 9 '13 at 18:14
    
What printer specifically? –  Jan Doggen Aug 9 '13 at 18:55
    
printer now added and also setup specified. –  user984532 Aug 9 '13 at 20:29
    
If the printer was an old serial one I'd suspect it was some sort of sync sequence. But that doesn't make sense for any modern printer. –  Daniel R Hicks Aug 9 '13 at 22:51

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