MacBook WIFI issue. States full signal but won't connect!

Hey all,
I'm at the end of my tether here! I brought my MacBook back in Feb and loved it, was so pleased with it. A couple of months later the screen broke, so it was taken back to Comet who sent it away and repaired it, turns out the screen was faulty and there was also a "defective logic board". Got it back after 3 weeks and all was fine, until now!
When i purchased the MacBook i needed to buy a new router so i got an N router which has always worked perfectly, over the last week or 2 i found the connection kept dropping out, this happened before and it was VirginMedias problem which they fixed. I checked with them and there's no fault, checked the router and there's no fault and no settings changed, i then decided to try a neighbours WIFI, again, the MacBook connected and stated full signal but when i opened Safari it says i wasn't connected. The problem got worse and worse and i'm now at the point where i cannot connect to any network through WIFI at all, the only way i can get internet is if i use my Vodafone WIFI Dongle...which isn't the cheapest or easiest way of connecting to the net! I also have an iPhone 4 and a iPod Touch and they both still connect to the WIFI without any problems.
If anyone can help i would appreciate it so much! If i take the MacBook back to Comet they'll only want to send it away again and i'm not happy to do that, 1) Because i'll be without it for at least 3 weeks and i need it for work and 2) Since i got it back from the last repair i've discovered it wasn't put back together very well and the screws have been falling out of the base ever since.

Since you cannot connect, even at at another location, I'd agree that it seems to be a hardware problem, rather than ISP or software settings.
If purchased new or refurb direct from Apple, your MacBook came with a 1-year warranty, so you should be well within the initial warranty period.
If you're not happy with the service you're getting from Comet, escalate! Ask for the manager, and keep going up the chain until you get some satisfaction.
Finally, if Comet can't meet your needs, try another Apple authorized repair center or an Apple Store.

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    ~~~~~~~~~~~~~~~
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