PSU/Motherboard

I have a couple of questions.

1. If a motherboard is dead will the PC turn on?

2. My PC shuts off after 10 seconds of turning in on. Is this due to a bad PSU

Thanks

I have a couple of questions.

1. If a motherboard is dead will the PC turn on?

2. My PC shuts off after 10 seconds of turning in on. Is this due to a bad PSU

Thanks

Vic_Vega1994