After installing Windows 8.1 on my Intel NUC computer, I tried to setup the wireless connection. Initially there were "No networks found." After a few restarts of both the computer and the network card, I was briefly able to see networks in range (I live in NYC and there are at least 20 wifi access points in range). A few seconds later, it reverted to "No networks found" again. Drivers are up-to-date and no amount of restarting the network adapter seems to help. Could the card be defective? One thing to note is that I originally tried installing Linux (OpenELEC) on this computer. I had the same problem with the network disappearing with that OS as well.
My system specs are as follows:
http://www.amazon.com/gp/product/B00DMCVKMU/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1 Amazon.com: Intel Network 7260.HMWG WiFi Wireless-AC 7260 H/T Dual Band 2x2 AC+Bluetooth HMC: Computers & Accessories
http://www.amazon.com/gp/product/B00BQ8RKT4/ref=oh_details_o00_s01_i01?ie=UTF8&psc=1 Amazon.com: Crucial M500 240GB mSATA Internal Solid State Drive CT240M500SSD3: Computers & Accessories
Any ideas? Could my wireless card defective?
I am sorry to hear you are having this problem but let me help you.
All the information you have provided is very useful. Testing different Operating Systems is definitely a very good step to discard options which I would say you narrow it down to a hardware issue.
So I wonder if you can try resetting the Wireless card and make sure to set again the Antenna on the card? Here you have the integration guide for this NUC:
If issue persists, I would recommend you testing the wireless card into another NUC or contacting the manufacture for a possible replacement.