I'm trying to connect a Teensy 3.2 to a PC motherboard to turn the PC on/off. The motherboard header is 2-pin (PWRBTN# and GND), like all PC motherboards.

I'd also like to use a 2-pin Y-splitter to enable both my Teensy and the physical PC power button to turn the PC on/off.

The voltage between the PWRBTN# and GND is 3.458v. If I short PWRBTN# and GND (turns the PC on), the current is 0.83 mA.

1) Can I use a simple Y-splitter to connect my Teensy and physical PC power button together?
2) How can I wire the motherboard to my Teensy and then use it to turn on/off the PC?