Cannot connect to WIFI - 'connection time out occured' but also says 'no ip address'

Hi,
I've searched the web and found endless issues with the wifi router / etc of the Imac Lion system. On the same wifi network we have a mac book (leopard I think), a pc laptop (which I am using now) and 2 phones + my brand new Imac with Lion osx. The first 4 items all connect with no problems.
I tried some of the sollutions here but it even made it worse as I now not have any connection at all!
http://support.apple.com/kb/HT4628
When I try to connect trhough systems preferences/network I get the message that my password is incorrect and that there is no IP address. Password is definitely correct. When I try to connect from the symbol in the right top corner - I get the message 'connection time out occured'
I am a bit of a Mac dummy ... any help is really appreciated.
Thanks
Billie

Hi BDAqua,
Thanks a lot for getting back to me.
Not so sure what your first questions means - or how to check this?
I tried joining other Wi-Fi network:
If I choose security 'WPA Personal' i get the message: connection time out
If I choose security 'WPA2 Personal' or 'WEP' i get the message@ no network found
hmmmm any suggestions? Thanks so much
Billie

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Cannot connect to WIFI - 'connection time out occured' but also says 'no ip address'

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