PC auto start and in 10 seconds shuts down (No Display)

[Martin Nadar]

When I switch on the main power supply (not the CPU button) my computer automatically start and in a few seconds in shuts down. The fan on the motherboard starts when i switch on the power supply and then stops in a few seconds.

Please help!

 

[Tradesman1]

May want to bench it, have a guide that may help here:

http/www.tomshardware.com/faq/id-1753671/bench-troubleshooting.html