My hard drive died last week on my Dell E6520.
I got my hands on a new hard drive and after connecting it I reinstalled Windows 7 (64 bit).
All went fine. When windows rebooted the screen's resolution needed to be fixed and the computer could not detect any wifi signals nor could it go online via an ethernet wire, etc.
I tried reinstalling all the drivers from the 4 dell CD I had. However, nothing changed.
I went online with a different computer to dell's site and put in my service tag It only listed two BIOS files.
I am at a loss as what to do.
Check if you could update the BIOS.
Restart the system and press f2 on startup to enter BIOS - load BIOS defaults - save and exit - restart and check in device manager if the hardware is detected under network adapters or if there are any unknown devices.
Download and install the required drivers here - http://dell.to/2fAQ7rV
Also, please click my DELL-username and write me a private conversation with the service tag and your contact details(Name and Email) for case records.
Let us know if you have any other queries.
Please provide the hardware IDs: