Question details:

I have a X2500 printer. I've checked all the cords and all is set up right. The printer will not turn off by pushing the on off button.

Answer:

Try to turn off your printer by hold the power button down for 9-10 seconds. If that doesn't work, disconnect the power cord from the printer. Reconnect it and restart the computer. You should try to replace the drivers with the latest ones available. Maybe is a compatibility issue.