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Hp design jet t790 has 86:01 error message, but when I press "ok" nothing happens

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Design jet t790
Microsoft Windows 7 (32-bit)

Came back after month off from school and tried to print. Got paper jam message, but then computer went to 86:01 error message. Even though I have pressed the "ok" nothing else is happening. Tried restarting but cannot get past message. Any suggestions would be appreciated. 

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You need to physically check out the plotter. Most times the issue is a bad carriage belt preventing the carriage from moving smoothly. Open the center cover with the power off and if the carriage is not all the way to the right see if you can move it by hand.  If you can is the movement smooth or bumpy.  If bumpy or very hard to move you may need to have the belt replaced.

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