Hello,

My company updated a new Dell Latitude E5430 laptop for me in February 2014. Everything was fine untile in the middle of March 2014: the wireless doesn't work since then. Wireless light on the keyboard will be on for one minute then off. There is a yellow alarm on "Dell Wirelss 1504 802.11b/g/n (2.4Ghz)" in Device Manager:

I already restored the system to Feb.'s restore-point, and installed new drivers from Dell. But no one was working. I also went to BIOS check and found Wireless LAN is installed, but Wireless WAN is not installed. Is it a hardware malfunction or softare related?