Hi,

Thank you for writing to the Dell Community Forum. 

I am suspecting it could be a software issue since both wireless and wired internet connection is not working. 

Please try a system restore to a previous date when it was working fine. Please visit the following links for instructions based on your Windows operating system:

Windows 7 - http://dell.to/1O0nAHK 

Windows 8 & 8.1 - http://dell.to/1DqJYzd