[ubuntu] Printer causes shutdown

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http://ubuntuforums.org – Running 11.04 SMB printer HP Photosmart 7150 shared by Windows XP sp3 USB printer Epson CX8400 AIO and yes everything works 1. Sent job to SMB printer and waited but no response so I sent the same job to the USB printer. 2. USB printer did not respond so I sent the same job back to the SMB printer and it started to print. 3. After the SMB job was finished the USB job started to print. 4. After the USB job printed the SMB job started again so I canceled it. Now after all that I took my printed page and left the room. When I got back my PC had turned off. any clues? (Hardware)