I agree with Rick. Some additional information is needed. In addition to the make and model of the router, is the router provided by your internet service provider? Also, have you taken your Inspiron out of your home to test wireless connectivity? If you have no problems when connecting wirelessly to an "away" hotspot... the issue is with your router and not your computer. You should always consider sources of interference when you have connection errors. Even if other wireless devices have no problem connecting to your home network, the interference could be effecting the N5110.
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