Built2burn

Hi everyone. This is my first post. I searched the forums and other locations but I couldn't find the answer.

I purchase a 2004 es330 about 2 months ago. Everything was fine but yesterday the stock radio wouldn't turn on (no display/cant eject cassette or cd/no sound). There is no navigation system just a radio with cassette and 6 cd changer.

I checked the 3 possible fuses, but none were blown.
All other lights and accessories seem to be working.

I read that it is possible the amp is dead, but wouldnt the head unit be getting power even if the amp is dead?
How do I test to see if its the amp before purchasing one on ebay?

I also noticed a ticking (relay??) noise coming from the dash (sounded like a turn signal) for a day or two before it died. Would this be related or just a coincidence?

Thanks in advance for your help!

~Jon