Sorry to hear this, but I'm kind-of glad you've posted here as mine did exactly the same thing yesterday. After restarting Windows, it went into some kind of 'firmware update' screen, and then processed about 12 lines of text detailing existing version numbers, and the version number it was updating to. Then it died! Exactly the same as yours sounds like it did - it won't turn on at all. I'm guessing that something has killed the BIOS on it and that the only way to recover it is to re-flash the BIOS EEPROM manually. There's a post on here somewhere describing how to do it, but it's not for the feint-hearted. I've ordered the relevant EEPROM writer and cable adapter from China, as this was the next thing I was going to try before giving up and concluding that it's dead beyond repair - because that's how it looks at the moment..
I was using my Linx 7 purely to run a single application to talk to my car's ECU. As such, it was an almost vanilla Windows 10 installation, with only a a single dedicated application installed. I can absolutely guarantee that I hadn't downloaded anything that might have caused this to happen. The only thing that can have caused it was that Windows Update was turned on and was up-to-date.
I reckon we're going to see a few more people reporting this over the next few days/weeks.