Macbook Pro 13" (Late 2013) does not connect to Wifi

Hi,
I just bought a new macbook pro 3 days back. It was working fine till it suddenly dropped connection to the home WiFi. Since then it shows a list of wifi options including the one that i was connected to but does not connect to it. The error message says that the computer cannot connect to the wifi. and asks me to run diagnostics
I have done the following
Run Diagnostic
Switched the wifi off and on
Restarted Mac
Deleted the network from the preferred list and tried to join again
Tried to manually enter the details of the wifi
Switched the router and modem off and on again
Any help would be really appreciated. It's just been 3 days with the mac and I wasn't expecting this.
regards,
ss

Does this connect to other WiFi networks?
As for the problematic WiFi network, see if  > System Preferences > Network > select the WiFi network in the left column > Assist Me... and see if the Assistant and the Diagnostics options can provide any insight into the connectivity problem.
Failing that, take the MacBook Pro back into the folks at the Apple Store and have them take a look at it, and see if it'll connect to the WiFi network there.

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