Macbook pro retina (1 month old) can no longer connect to Wifi

First of all I love my new mac, had no problems with it so far, and it's more than adequate for my requirements. However came to connect to my Mum's home network today (my iPhone and her windows desktop are connected right now so I know there's no problem with the ISP) and it won't connect, even though I've typed and re-typed the password a million times over. Was thinking initially she's changed the password without telling me, but I know that can't be the case because a) she's a technophobe and b) my iPhone wouldn't automatically connect (it was 3 months since the last time I was over). Then what struck me is last night I had similar issues round a friend's house where I've never connected before, but then so did he with his Macbook Pro (3 years old). However we reset the router and went to bed and this morning his worked fine; mine still nothing. The last time I succesfully connected to a network was on Friday, on the train down here, when I was tethering my iPhone's 3g connection. Could this be something to do with it? I've tried running network diagnostics several times but it never gets to the second stage as it can't connect to this network, which considering I'm using right now, I can assure you is running perfectly smoothly. The main error message I seem to be receiving both today and yesterday is 'connection timeout'. Is there a possibility I have somehow disabled my wifi connectivity? I can't seem to see where though. Having just purchased the mac I would've of course contacted applecare, but rather frustatingly they're closed on Sunday's and with a 3000 word report on HR Management that I need to finish today I can't afford to wait until 8am tomorrow, and I'd really appreciate some help beforehand so I don't have to complete my work on this ancient, virus-riddled pc!!
Many Thanks Folks!
Ryan, Norwich, UK

By Jove, after a couple of hours of stress I think I've just cracked it; I went onto System Preferences> Network> Advanced and then simply deleted a couple of networks I've connected to only once but won't need again and then it seemed to do to the trick. So it looks like you can only store upto 10 networks; I'm astonished it doesn't appear to say this anywhere in the manual!? Maybe it's too obvious and I'm an idiot for not already possessing this knowledge but come on, considering the box 'remember this network' is automatically ticked, surely this is a problem that your average user is going to experience rather frequently. How hard would it be for Apple to introduce an error message along the lines of 'maximum number of saved networks exceeded... Please delete one or more saved networks...'!? As for the applecare centre being closed, it would've been really useful if the sales rep could've mentioned this simple fix; It would have taken all of 10 seconds and would've saved me a lot of time and frustration.
It would be nice if this discovery helps others, but perhaps I should really be apologising for stating common knowledge. Well I guess the lesson here is what I already knew; the more you experiment with OS X the more you learn. Thanks to anyone who may have helped, back to the work now ....
Ryan

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