Corona 4gb slim

I have a Corona 4gb that doesn’t want to start. It beeps when I press the buttons. I checked to make sure the USB wasn’t shorting, and also tried different faceplates and rf boards. Anything I should be checking on the motherboard?

What do you mean by it won’t start? Does it beep then turn solid red, blinking red, or beep then shut off?

No, It just beeps. Fans don’t spin, lights don’t light.