continuity relay to power a pc

https://www.the12volt.com/relays/page5.asp#ctm

you should be able to use this. you would just have to use pins 87 and 30 to go to either sides of your power switch. that way when the relay is triggered by your remote turn on wire on your radio would activate the relay which would connect the power button wires on your computer and the disconnect them acting like a "push" to your power button.

that situation would turn on your computer as for turning it off im not sure how you would be able to do that.

Jonathan

The "easiest" way to do this is to buy a power supply designed for a car.  They will make things MUCH easier.  Not required by any means, but they sure are convenient.  The power supply I have is hooked to the ignition signal in my car - when I start the car it pulses the "ON" contacts.  When I turn the ignition off it pulses the "ON" contact again - if the computer doesn't shut down for some reason after X amount of seconds it kills power to the computer.

I would contact the suppliar and try to get it fixed.

Otherwise, you can use a "constant to pulsed" relay:

This would work great as long as you use a switched ignition source for the main power to the computer (this can be done with a second relay if needed).

The other thing I would investigate is what happens if you just short out the "ON" button?  On some motherboards they may start up and stay on, even if the button is held down.  If that is true, a simple relay set up would suffice.