Activate your computer using a mobile network connection.
Activate your computer using a mobile network connection.
In that scenario the relay must be linked to a constantly running device like an Arduino connected to the network.
No need to press any buttons. A signal can be sent from one computer to a USB port, which then controls a MOSFET linked to the power connector on the target system's motherboard, allowing the required current to flow.
Using just a single transistor might seem complicated, but there are simpler alternatives to consider.
I've learned about a feature called "wake on LAN" that can manage your motherboard remotely. Your friend mentioned it's possible to influence BIOS settings, possibly using a router and another computer sending a signal. You could potentially set up a silent PC for around $100 using just a router. This would let you handle server tasks from home without needing constant phone calls. I understand you're concerned about noise from the HDD and prefer a quieter setup.