Hmm, interesting idea, but might I ask what your target audience is for this device?
My background: I work in a medium sized company in IT. I am not directly involved with PC support anymore, but once was. We have more than a thousand workstations, but most of them are not classical desktops anymore.
With that in mind, thoughts about this:
1: Power savings could easily be achieved by using wake on LAN. But even without it, disciplined users will already shut down their workstation anyway. And even if not, though I have not measured it, power consumption should already be reduced massively by employing sensible power plans in Windows. Assuming 100 Watts for an unused computer is not reasonable.
2: Reading through the description, I have to assume that your device is "always-on"? Does it work at all without internet?
3: How is the WiFi connection realized? Which bands and channels are supported? How does your supposed simple connection work? How much bandwidth is used? Think hundreds of devices here

4: Error detection according to the beep codes sounds like a neat idea. But I have not seen (or rather heard

) a beeper on any modern corporate desktop for many years. DELL for example uses diagnostic LEDs since at least 15 years.
5: How does the Freeze/Crash detection and storage monitoring work? For that to work reliably I would think you need a driver of some kind. What operating systems will you support?
6: The device seems not applicable to laptops. And many desktops are being replaced by laptops.
Don't get me wrong. I applaud you for getting this far

Getting a viable product to this stage is an achievement.
But I wonder if you are not a couple of years to late, considering the state of the desktop market.