Transonic TC2884STB no pic and wont change channel.

Exactly that, Transonic TC2884STB If I turn it on (with the av leads plugged into the TV) I get a small icon in the bottom left corner (looks sorta like a speaker with a line through it but pressing the mute button doesn't get rid of it) and thats the only thing displayed,
if I try changing channels using the remote or the transonic box itself they don't change, the transonic box just displays "12" on its display and the TV displays the blue av screen with the aforementioned icon in the corner, pressing any keys on the remote do nothing except the power off key which turns it on or off.

I have had the device for quite a while (I think I don't remember when i bought it and I don't have the receipt anymore), is there a way to reset, reboot the device

As I have lost the manual the only thing I could find was this

http://www.orientalpacific.com/backend/files/products/manuals/432/Updated%20Manual%2017.11.11.doc

which appears to be the manual but has no info on reseeting the box

Thanks in advance