Go to device manager and disable your wirless network adapter.wait till ten seconds.then enable it again.......
please also make sure that your device driver is up to date...
Are you able to see the networks ? If yes then make sure you are entering the correct wifi network password. If you are not able to see wifi networks then try enabling disabling the card by holding Fn key and then pressing F2
SOURCE: no sound on my laptop dell inspiron E1505
I found many references to this issue but I am not sure which may apply
to your problem. Here is a set of steps to follow from another site:
(Assumes Vista and Realtek)
SOURCE: dell inspiron 6400 E1505 wifi
http://support.dell.com/support/downloads/driverslist.aspx?os=WLH&osl=EN&catid=-1&impid=-1&servicetag=&SystemID=INSPIRONI6400%2FE1505&hidos=WW1&hidlang=en&TabIndex=
Here is the link directly from dell for your model and OS
SOURCE: My Dell Inspiron E1505's monitor is dark. It
You might have to replace the Back light lamp or inverter.
Read this for more info : http://www.dslreports.com/forum/r20059306-crtlcd-dell-inspiron-e1505-backlamp-not-working
SOURCE: Inspiron E1505 Shut down problems
1.if you are using vista rather thatn clicking on the shutdown icon,click on the arrow next to it and choose shutdown.
2.wait for your computer to completely shutdown before closing it.(xp/vista)
3.Check your computer for viruses with a good antivirus software.(xp/vista)
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