My MacBook doesn't connect to my network, in one part of my room.

This is really strange.
I have a black macbook (4,1) running Lion 10.7.2.
It refuses to connect to my home wifi in a small area in my room; which happens to be where my desk is.
It's not the router, every other device is fine; I even have an XBox 360 a foot away from my macbook, and it's connecting fine to the network.
I am forced to go to the centre of the room, just to use the internet sometimes.
I've been working since October with my desk and router in the same positions and it's only been affecting me for the passed week or two.
It's not like I'm out of range, my macbook is right above the router (which is downstairs), and a bit to the right (from my working perspective). As I have previously noted, my XBox, which is a foot away, is connecting with no issues.
Is there something in the last update which may have caused this? Is it just wear-and-tear on an 'old' wireless transmitter/receiver? Could there be some form of interferience being generated by other devices?
Any help on the matter would be much appriated — it is very inconvieniant (to say the least) to have to come to the middle of my room to re-connect, and hope that the signal will continue (which it occationally does) when I go back to my desk; and when it doesn't; having to work in the centre of my room/ on my bed.
I look forward to any helpful comments
Thank You
Matt Parnell

It's a shame no one has an idea about this.
Since the post, I have discovered that the issue is due to my secondary monitor — somehow.
When the monitor isn't connected, webpages load quickly and normally; when it is connected this issue occurs often. I have just tested this by loading a page [which loaded fine], reconnecting the monitor, loading the same page from fresh [it got stuck], disconnected a reloaded the page from fresh [which loaded fine].
I tried this a couple times, which seems to suggest that connecting my secondary monitor affects my internet connection.
Any thoughts on the problem?
Matt Parnell

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ross1306 wrote:
Anyone else seen this issue?
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