I have the same problem but mine was caused by a power cut. This procedure is for a slightly different problem but might be worth a try.
1-switch off printer itself
2-switch off at socket for 20 seconds
3-hold down both black buttons on front
switch on at mains
4-switch on printer itself
green and red flash together
5-now switch off at mains and leave for 3 seconds
6-while holding down both front buttons again, switch on at mains
both green and red flash together so release
7-quickly hold down the left botton, the one with the scroll
icon above it.
Hold this until it resets itself, - the print head will re
charge and it will be obvious.
restting by unpluggin rather than turning off at mains tends not to work. hope this helps.
good luck
Heather
May 2009