While I sympathise that you have a problem, I don't think you are going to do yourself any favours if you go to PC World insinuating that they have deliberately caused further damage to your laptop. It already didn't work, why would they bother? I've worked in customer services a few years ago and while I'm sure this seems close and personal to you, but unless you've verbally assaulted a member of staff, you are just one of many people with a problem and they just aren't going to care enough about you to be vindictive. Why would they have to anyway, from my limited understanding, the burden of proof that a defect was present at purchase would be on you after this length of time. There would be several ways that the fault you described could have been introduced after purchase so I don't think you will get very far. As to how a liquid might have got into the laptop, while I'm sure you are correct that it hasn't been swimming in any lakes recently, are you telling me its never been near a cup of tea or a can of soft drink? Maybe Its just me who is sad enough to occasionally have a drink next to me while I'm working on my computer. I look forward to what will undoubtedly be an amusing episode of this BBC show where you try to argue that you are special enough that PC World employees felt like victimising you by carefully crafting evidence showing that a fault that already occurred outside of the warranty period was your fault.