Can't connect to wireless network but connects if I move it 1 meter

Hi all,
I've had my 27" iMac Intel Core 2 Duo for over 3 months now with no issues, but suddenly over the weekend I can no longer connect to my network.
Sometimes I can see my network listed (but the signal is now very weak when it used to be very strong) and when I try to connect I get a "Connection Timeout" error. Othertimes I can't even see my network.
If I move my whole mac about 1 meter "closer" to the router (it sits downstairs, my mac upstairs) it connects fine. But as soon as I put it back on my desk, where it has been sitting for the past 3 months, the connection drops out or it can't find the network. (I can't leave it "closer" to the router, as that would mean I'm sitting on the floor right in my room doorway...)
All other PC's, laptops, my MacBook and iPhone all connect fine. In the MacBooks case, it connects fine in exactly the same spot as where my mac had been sitting for the past 3 months.
I'm using a Belkin N150 wireless router which is supposed to have a range of 300m (my house is definitely not that big!) and using a WPA2 Personal password security setting. As I said above, no issue before this past weekend (same router, same settings).
I have tried the following:
- restarting router, modem, computer (in various orders) to no avail
- deleting the system configuration folder, re-starting, etc.
Just wondering if there's something I'm missing? Or whether or not it's to do with the wider issue of connecting that people seem to have? I thought it may be different since I can connect if it sits somewhere else...
Any help wold be appreciated since my support has run out!
Thanks in advance!
Message was edited by: chuppachup

Yeah I've tried moving it but unfortunately I'm a bit constrained as to how far I can move it (aprox 20cms each way). There are lots of ethernet cables plugged in and they all run behind what is, a very solid, very big desk/shelving thing.
However, the position of the router hasn't changed in the past 3 months.
I've also tried disconnecting the cordless phone which sits in the same room and moving any extra cables around the router to no avail. But none of these things are new either.

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