have i a permanently broke my camera ?

I have a casio exilim digital camera and I recently took it on holiday to Majorca. of course it was very hot and I took it out for a days sightseeing and all of a sudden the camera froze and the screen became fuzzy and none of the buttons would work. in fact the only way to close the lens is to take the battery out and 'retry the on/off button and the lens closes. I have tried taking the battery out and even the card out for a few hours but of course it makes no difference.

strangley my friend took his Fuji camera and the screen/pictures have interference lines on them, so his isn't exactly working very well.

I have been told it may be sand in the camera, but I didn't take it on the beach at all I think I may have i may have overheated/fried a part of its workings although of course I am not certain.

basically I think I need a new camera, but hey you might know better. it's turning into a much expensive holiday than I at first anticipated .