First you could try removing power plug and then holding down printers on/off button for 20 secs to clear any residual memory. Have you just changed the ink cartridges? if so try re-seating them. Or it might be the waste ink pad 'thinks' it is full (it's on a counter and you need to reset that)
There is a link to download a service exe on thread http://forums.moneysavingexpert.com/showthread.php?p=37354916
If you do have to take out the waste ink felt pads that are 'full' and wash them out under tap, it is very very messy and then you have to reset the counter anyway.