Did One of My Amps Die?

[Frunobulax]

Today, I started my car and got no sound out of my head unit

(Kenwood). The display lights up just fine, however. I have my sub

hooked up to a separate amp from my Polk separates, so I thought that

if one of the amps had gone bad, I'd still hear a signal from the

remaining good amp. However, there is no sound at all through the

speakers. The other day, I started the car, and had to wait for about

fifteen seconds longer than usual for the sound to come through the

speakers.

I don't have a lot of knowledge of car audio, but does this sound like

the head unit itself might have died?

If you need any more information, please let me know. Thanks in

advance!

Add-on:

Tonight I turned the radio off and then back on again. The sound appeared for a couple of seconds, but as soon as I raised the volume, the sound cut off again, so I'd guess it's not the receiver itself. However, when the radio is on and the sound is out, I *do* hear a faint sound coming from the back of the car where the amps are. It's a cyclic high-pitched sound; it cycles about once a second. The sound is akin to the sound made when stretching the neck of a balloon really tight and letting air out of it. Sorry, but that's the closest I can come to describing the sound.

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