Thanks Plastic Nev that's good to know. Jelly Bean, yes I've booted up with F7 got to the repair screen, today I've tried to use the 'Restore to factory settings'. It gets to about one centimetre along the bar - then just sticks.
I've tried system restore - but the screen just crashes. Last know good config - just crashes.
Its daft really because the pc is only about a year old.