no picture/sound on Transonic tv?!?

hi, hope anyone can offer some advice. i bought a Transonic tv a couple of months ago (new) and suddenly the channels have stopped working! the channel number still appears in the top corner as normal, however the picture and sound is not there, and it refuses to tune in. could be a coincedence, but it happened just after i used my ps2 on it (the ps2 can still be used through the tv, as well as my dvd player). i've tried switching between the tv and av channels, re-tuning it, and going through all the settings but nothing is working!

any help would be much appreciated....thanks!