Printer and Photocopier Troubleshooting and Repair Collection : HP LaserJet random behavior - no ground 
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HP LaserJet random behavior - no ground

Aside from surge supressors not being effective (to the extent that they ever are) without a proper safety/earth ground, here is another example of possible symptoms:

(From: Leif Gastgivar (lgastgiv@technis.syh.fi).)

I bought a new HP Laserjet 5L printer and I just plugged the printer into the socket. After a time the printer started to print out pages by its own. I checked out the manual but I couldn't find out the problem. But after a wile I find out, that the printer wasn't connected to the ground. After I fixed the problem, it will have been working properly.