Hi Today. My Sculpt Wireless Mouse stopped working. I then found that my network/intenet connection had stooped also. Searching around, all avenues said no network card found. After several attempts (about 6 times), shut down - wait - restart, I managed to get started again to this point. During my attemots to restart, sometimes just got as far as 'Surface' on the screen and then stall there - once or twice managed to get into desktop where everything except for bluetooth and wireless connection. Searching for devices just reported none found. Despite the above reports of no network card found, looking in Device Manager where there were about 6 entries under Network Adapters and all said device working normally, however, at this time where everything seems to be OK, there are just 3 entries in the same Network Adapter listing (Bluetooth personal area network, Bluetooth RFCOMM protocol TDI and Marvel AVASTAR network controller) - none of these were in the list when the fault was present. Any ideas, any thing I can check while in working state? Could it be a heat issue? Is a replacement Marvel Network card (which I suspect is the issue) a straightforward thing to have done - is it costly to have such a replacement done (if indeed that is the problem)? My Surface Pro 3 is about 2 years old (from memory) Any help would be appreciated as this is my only computer and I really don't want to buy another just to get this issue fixed.