WiFI help plz...

[storx]

I have installed countless builds on my phone thinking maybe i had a bad build.. then i went back to the stock alltel rom and it still not allowing me to connect to WiFi. I can reset my phone then when it boots up it will detect the 2 wireless routers i have in my house. when i go to connect to them it attempts then fails and then that router is no longer available. I dont have internet problems with any other device but this phone.. i have an old PDA Ipaq and it connects to both routers without a problem and surfs the internet... but i cant this one to connect. can someone help me on this plz