What to do if you can't access a wifi network and showing you message that your airport has a self-assigned IP and cannot be connected to the internet?

Hi,
i am currently using 10.6.8 snow leopard
i usually access internet through my broadband modem and wifi at home.
i've been using our home wifi network for almost 1 week now (since it's new) and almost everyone at home use it as well.
and im using my broadband everytime i go out.
this last week, i went to a vacation and i use the wifi connection of the hotel where i stay in.
my connection works fine and so i don't use my broadband anymore.
then i got home..
when i got home..  i tried to connect to our home wifi network again .
like what im doing before, im clicking the airport icon on the top of my desktop,
and since my airport is always on, the next step that im doing is to click the preferred network that i want to join and put the password on it.
this is perfectly working in my macbook before i left.
but now , it's not working to my laptop anymore! i can't connect to it!
after putting the password and hitting the enter, the airport icon at the top will run, however after seconds it showing gray color with exclamation point on it!
the alert is showing : No internet connection
but the network i joined is still checked and showing full signal !
i tried checking my Network under system preferrence and the airport tab in the left corner is showing me a message that
my airport has the self-assigned IP address 169.***.****.** and will not be able to connect to internet!
i don't know what happen and i dont understand why is this happening since everyone at home can still use and access our home wifi !!
it's the same network that i'm trying to connect to anyway!
i tried using my broadband instead to connect online and it works fine!
but everytime i try to connect using wifi at home , again i cant connect!
anyone can tell me what's going on?
i haven't try joining other network anyway! but i'm planning to do so..
can some one help me please??
showing me a message that
my airport has the self-assigned IP address 169.***.****.** and will not be able to connect to internet!

and now, when i tried to check again my network preference below the airport tab is showing a message that
"my airport does not have an IP address and cannot connect to the internet!"
then after seconds it will goes back to the first message that
"airport has the self assigned IP address etc....."
i don't know whats going on now!
airport tab is not showing green color anyway! i'ts always in yellow!
i tried turning it on and off but nothing happen! HEEELLLLPP!!!!

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