My macbook pro can see my home wi-fi network but cannot connect to it.  My iphone and ipad are connected to my home wi-fi so the problem is not the modem.

Wow, I tried to submit this as a problem and the computer lost the wifi connection again, so i lost the whole explanation i typed up. 
I've turned off computer and modem multiple times.
When I tried to run the network diagnostic, the macbook pro gave me a "perhaps you are out of range error".  I am sitting next to the modem.
My iphone and ipad are wonderfully connected to the home wifi network, so it cannot be the modem/router, correct?
If I am on the same floor as the router/modem then the macbook pro can see my home network but after tyoing in my password and trying to connect i get a "timed out" message.
If I move down one floor, then the macbook can see and connect to the wifi.  I only have one modem on one floor.
Is there some sort of diagnostic I can run to see why this particular device (macbook pro) is behaving ths way?  It just seems weird because the computer could connect to the wifi network yesterday while i was sitting next to the router. 

SOLUTION! 
I've been suffering from this problem for a few months.  I tried everything suggested by everyone, and then, today, I had a mad idea. 
I used to work in a room in the house that's about 12 metres away from the router. It's on the next storey up and horizontally about 8 metres away.  The problem started when I began to work in the same room as the router. 
Today I became so frustrated that for some reason I walked into a room about 8 metres away on the same level - Guess what?  I connected with no problem at all. Feeling full of joy I walked back to the room where the router is located - Dropped internet connection within a few minutes!  Walked back to the the room that's 8 metres away and, hey presto! I have a connection. I now realise that the problem was that I moved too close to the router.
I can think of no logical explanation for my experience, but empirically it seems to work.  Does anyone have the faintest idea of why this should be the case?  In the absence of an answer I think I may have to start believing in fairies at the bottom of the garden - I'm just off to set a meal for them.
By the way, I don't know if it has any significance, but the router is a BT Infinity router that has replaced the incredibly unreliable Virgin Media cable connection

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