Two lights not power light flashing intermitantly

If you mean the ink and the paper lights are flashing at different times (ie: paper on, ink off... then paper off, ink on) then your printer is telling you it needs a service.

Rather than reinvent the wheel, here's an article on the whole thing:
http://www.wasteink.co.uk/service-required/

You can find more information on your particular printer here too:
http://www.continuousink.info/forum/viewtopic.php?t=4100