Arduino/pc control project

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So I have this idea, I have an enthoo mini xl case I plan to build a nas and a gaming pc in (it's a dual system case) I haven't nailed down the exact hardware for the motherboards yet but what I DO have is an Arduino mega and a BeagleBoneBlackII. Ive had these boards for awhile now and couldn't really think of anything to do with them until now.
What I want to do is use one of these boards (leaning towards the beagleboneblack) as a controller for the two motherboards

*It could be powered by a usb headers standby power
* have it as a "wedge" between the two power and reset buttons on the case and the power and reset jumpers on the motherboards
*I could also wedge it in between the hdd activity jumpers and the case leds for conformation of both motherboards powerstate
*the beagleboneblack has a 10/100 either net port so it could always be online listening for commands.

I've been teaching myself java and it's slow going with work and all but I would like to write and app for my android phone to ssh into the BBB report the state of the two motherboards (on/off by hdd activity) and have buttons in the app for Turning on,Resetting, & Turning off the two motherboards.

Things I don't know
*I don't know the voltage of the jumpers, I don't know if most motherboard manufacturers agree on a standard for them or not. Also I don't have the motherboards as of yet so I can't measure to find out for myself. I may need to put a risistor in line to protect the ic.
*in using the usb header to power the BBB, I don't know if the power spikes or drops when turning on or off the motherboard supplying the power. I may need to use a battery as a capacitor to even out the power to protect the ic
*I don't know how i should go about shutting down the two systems cleanly. I do plan on having a ups for them but as of right now I don't know how to "wedge" that

This is my first post and with all the topics this project touches I wasn't sure what topic I should post this under. I'm asking for your thoughts on this, it's viability, things I may not have thought of ect. I think it's a cool idea and I think others would want to do this as well. Also the BBB is kind of a powerful little board, there might be other things I could add to this project like a real time chassis intrusion notification ect.

Well I hope this sparks someone's imagination :)
@wendell help me bro!
A cloud of minds is better than just mine.

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should be able to configure the computer to shut down when you press the power button
in windows is in the power settings, choose what the power buttons do(something like that)

http://askubuntu.com/questions/86376/how-to-specify-power-button-to-do-a-shutdown-h-now-instead-of-graphical-shutd should work for most linux distros but depends on how the acpi stuff is configured i guess.

not sure why you'd want to for the gaming pc anyways lol,(usually to game you'd want to be there to not have latency issues and such from trying to play over vnc or something) but for nas/server even routers and stuff i can see why as remote management is convenient, but for a personal system idk XD.

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I'm going to do basically the same thing. The signal voltage for the power reset buttons should be 5V which should be fine for most Arduinos. I also believe that you can much more easily program the Arduino to display a web page as it's only a few lines of code for a simple page and there are already some shields that are designed for that. You could also configure the Arduino to connect to wifi.

To power the Arduino I would tap the standby power. Tap the purple wire and any black one. I would personally pick up a 24 pin extension cable and tap that, not my PSU. Once you're wired into the PSU you should be able to power up the PC by pulling the power pin HIGH with the Arduino. Same with the reset pin.

Also, I would personally go with Arduino, if I haven't kind of hinted at that by talking about nothing but Arduino. Shit's cheap. The Arduino pro minis are like $3 USD from China.

https://www.aliexpress.com/item/1PCS-ATMEGA328P-Pro-Mini-328-Mini-ATMEGA328-5V-16MHz-for-Arduino-Free-Shipping/32555683011.html

https://www.aliexpress.com/item/Free-shipping-ENC28J60-Ethernet-module-the-pi-interface-to-Ethernet-for-arduino/1878161526.html