Macbook Air won't detect home wireless network anymore

Hi

hoping someone can help me as I ran out of ideas... my Macbook Air was connected to my home wireless network (WPA protected) when all of a sudden when I closed the laptop and re-opened it, it will NOT detect my home network anylonger!!

I tried everything from deleting preference, resetting SMC, PRAM, creating a new position,change the network's name... EVERYTHING. I even completely wiped it out and re-installed Lion.

It simply won't detect my home network. It's even weirder because it detects other wireless networks just fine. All other laptops, phones, printers at home can connect to my home wireless network with not problems...

This is so weird....please help!