My flash stopped working

[vix]

I have a Canon powershot S70. Today the flash stopped working.

It's definitely set to come on and it's definitely dark enough. I've restored factory settings :/

I've read one instance of someone having one where the flash burnt out but he took a pic of it and you could clearly see the plastic was burnt.

For some reason it is only switching between auto and no flash, whereas I'm convinced it usually lets me force a flash. However in full manual mode, the flash still wont fire.

Can anyone think of any other buttons I can press to see if it's just the camera gone scrwey or if the flash really has given up?

If the flash has given up, can I do anything about it?