vlad.avilov,  Sorry for the delay, work.  5 days old, you're under warranty. I would contact Dell Tech Support and they can fix this.   Rick
Just short description:   1. My laptop is Dell Inspiron 7720 (I tried to install several drivers, but only Intel Centrino N 2230 driver installed without any exceptions) So, I think, that I have Intel Centrino N 2230 WiFi adapter 2. WiFi was working several days after I bought laptop (OS Ubuntu 13.1). 3. Then I pressed Fn+F2 and turned off Wifi and bluetooth adapters 4. After that I was not able to turn them on,  and I tried several things:   a) I've reinstalled OS with clean Windows 7 b) I've installed all drivers, that are required for my laptop. that I took by Service Code from Dell site c) I've installed latest drivers for WiFi from Intel site for Intel Centrino N-2230 c) I've checked Dell Quickset application, and I see, that checkbox, that turns on Wifi and bluetooth, is disabled d) I see, that Wifi and bluetooth adapters are absent in Hardware monitor in Windows 7 (I don't see them even in unrecognized devices in Hardware monitor. btw, no unrecognized devices in this monitor) e) I've installed Everest and I see, that it didn't find WiFi adapter too f) I've installed Intel Centrino problem diagnostic tool from Intel site, and it says, that "Your driver isn't attached to your WiFi transport" g) I've checked BIOS configuration, and found, that all hardware and hardware options are Enabled h) I've took different Windows distributive, and repeat all above steps - the same result  And still Fn+F2 doesn't turn on WiFi and Bluetooth. What I plan to do now: I'll try to switch Windows power management from Satndard to HighPerformance, I'll try to turn off Battery Saving Mode, I'll try to reinstall Windows and reinstall drivers with recommended by Dell order, but still a little hope, that this helps.  Could you, please, advice what else can I do to make my WiFi working? I'm really frustrated and will very appreciate if somebody helps  Best Regards, Vlad
[DISASTER] OS cant find WiFi adapter