https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/IP4500/m-p/38791#M2919 <P>I get the 'printer head not installed' error message and the light below the ON/Off switch blinks yellow. I have removed the ink cartridges and the print head and re-installed as per your advice on another thread but to no avail. Also, the paper tray selection switch is stuck on the upper setting i.e. it won't allow me to select the bottom tray. Your help please.</P> Fri, 06 Sep 2013 13:40:01 GMT FD11a 2013-09-06T13:40:01Z https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/IP4500/m-p/38791#M2919 <P>I get the 'printer head not installed' error message and the light below the ON/Off switch blinks yellow. I have removed the ink cartridges and the print head and re-installed as per your advice on another thread but to no avail. Also, the paper tray selection switch is stuck on the upper setting i.e. it won't allow me to select the bottom tray. Your help please.</P> Fri, 06 Sep 2013 13:40:01 GMT https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/IP4500/m-p/38791#M2919 FD11a 2013-09-06T13:40:01Z