The laptop was used 2 hours before the wifi adapter suddenly went "missing", as in no wifi driver is shown in the Device Manager list, and when I try to install the driver, the installation was unsuccessful due to absence of hardware.
Now, this laptop was bought 3 years ago, and this problem reoccurred a few times, each time it just magically fixed itself after a couple of days. The problem usually happens after having carried the computer outside during bus ride, so I'm guessing the hardware component somehow got shaken out of place?
What should I do now to fix the problem ASAP? Thank you!
What is the current OS installed on the system? What is the wireless card model on the system? Does the ethernet work fine?
You cannot install the driver if the hardware is not detected.
Update the BIOS if possible - http://dell.to/2fvY6Hc- restart the system and check again.
If the card is still not detected, then try reseating the wireless card and check. Download the service manual here - http://dell.to/2fw2juI
If it still does not work, then you could try replacing the wireless card - you could order the parts here as well - http://bit.ly/2eP1069
If there is no warranty, then you could contact our team to get a quote for a paid service call - http://dell.to/1vnT6CQ
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.
You can click the link to download the onlne service manual. The manual will provide steps to open the computer and reseat the wifi card. It may have come lose a bit from the slot.
Inspiron 5521 Drivers, Downlads and Manuals