JVC mx-kb30 Stereo comes on then goes right back off.

It sounds like whatever is connected to the aux socket has a bad earth connection check and replace the cables to it.

First check that the speaker wires are not shorting, if okay! the problem is in the audio output stage of the receiver, the protect mode comes on if a load is detected.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Turn the stereo on, wait two minutes for the demo to start running then press the "demo/cancel" button located under the "sound mode" selector.

when i had this problem my wires were touching the case. other times the wires were touching eachother

Maybe something's jamming it, try fixing the drive, so it comes out.

either the tuner is bas or the antenna is not hooked up.

Maybe you should fix the cds or clean them or try to fix the disc reader in the radio.

press &hold stop then press the eject button.

Have it first cleaned by a cd disc cleaner or if you are familiar with cleaning the lens manually im sure that will work...or try inserting an original cd's,if it works with that find the solution to the settings of your device...