We waited until lunchtime yesterday for the engineer to turn up. When he didn't turn up Mum and I contacted PC World and found out that their depot had a power cut sometime in Monday night and messed up all of the deliveries and engineers.
Anyway we have sorted out for another engineer to come out to me sometime on this coming Saturday and hopefully fix it whilist he is at our house. I am really hoping that he fixes it on site, because if he has to take it away, it can be up to 2 weeks before getting it back again.
I will either update you over the weekend, or on Monday 22/11/10. At least it is covered by exteneded warrenty.
BTW, I think it is the motherboard, because it is just not starting up. Or it could be the Power Supply. Anyway they do have very good customer service and engineers.