Sorry to hear of more people having this problem. To be honest I still haven't got anywhere with FS. They never responded to my letter after 14 days as requested so I called up. I spoke with a woman called Sue Young; she was who I was told to write to.
It was awful as she had no idea who I was and what problems I was having. When I explained she said "ah, that sounds familiar", great service eh. Anyhow she didn't have clue about anything technical so she suggested I try the warranty hotline to see if they could diagnose the problem.
On Friday evening I called up and spoke to a guy called Imran. I was on the phone for over an hour and got nowhere. Every suggestion he gave I had already tried. The outcome was that the want me to send of the tower for inspection and diagnostic testing. However if they deem the fault to be environmental, as oppose to hardware I will be billed about £130.
This really annoyed me as he said that if they can't find a hardware fault, then it is likely to be dust (environmental) and this isn't covered by the warranty. I'm not sure about sending it away as I'm not convinced they know much about computers and I'm not paying that much for fun.
Simple fact is FS as poorly designed computers and they're warranty doesn't count for S"*t.
I will be calling Sue Young back this week to express my dissatisfaction and I'll let you know if I get any joy.