Switching Amplifiers on when computer wakes up.

Hi guys: I tried this question on PC forums but they were clueless, I figure this might be a better forum.

I am trying to switch my power amps on (they run my PC speakers) when the PC wakes up. I am currently turning them off/ on manually and whats the fun in that.

I have a solid state relay that can switch 120vac-240vac (I think) with a DC input of 3vdc to 24vdc.

Question is how do i feel voltage to the relay that is dependant on the PC's wake state.

I could run a loop from the PSU's 3, 5 or 12v lines I guess to trigger the relay, but am fearing cross contamination of HF from the PC's switching PSU going into the Solid state relay and finding its way into my analog power amps.

Whats an easy way to accomplish this?