radio hook up

[ray_mcavoy]

You're welcome!

It sounds like you have things hooked up correctly. The fact that your PC power supply is shutting back off could be due to it's minimum load requirements. Many of them will turn back off if they don't have a minimum load on the +5V output. And since you're only using the power supply's +12V output (yellow wire) you aren't placing any load on the +5V output.

If that's the case, connecting a 10Ω, 10Watt power resistor between the +5V output (one of the red wires) and ground (one of the black wires) should draw enough current to keep the supply powered on. The resistor will get hot so mount it somewhere that won't cause any problems. Maybe even place it where the power supply's fan (if it has one) will be moving air across it.