How can i fix my Goodmans GD11FVRSD32 320gb twin tuner digital tv recorder?

My Goodmans GD11FVRSD32 320gb twin tuner digital tv recorder has frozen without a picture showing on tv screen, both yellow power light and red recording light are on constantly (no flickering) and I am unable to power off. My scart cable works fine as does my freeviews power cable. I have tried turning it off several times and unplugging device for a day, these don't work. Help?