problem with wi shiled

i am trying in robo car controlled in android wifi. i am useing wi-shiled for the wifi signals connected in arduino board. i sucessfully connected in laptop wifi in ad-hoc mode.

But when i program my wishield in infrastructur mode its not working. so i couldnt connect it with my android mobile.

Please help me in finding the problem and make my wi-shiled to work in infrastructure mode.

When you change your Wi-Shield to infrastructure mode, does it successfully connect to the access point?

No...... my wi-shiled led itself doesnt lights up. and i couldnt see my wishiled name in and access points.