@ATrueNewbie Here is the solution that worked for me.Connect your PC directly to a mains supply.Avoid multi power sockets and /or other devices share the same socket. It is likely the very same reason that your pc worked flawlessly in the repair shop...

Thanks for replying so soon.My motherboard is a brand new ROG Strix Z790 F Gaming WiFi.My problem was the same as this and other posts but I FOUND THE SOLUTION.Pass it to your R&D Dept and to your users mentioning the same no booting problem.After re...

This is not a solution given by Nate.I have exactly the same problem with a brand new motherboard with different PSU and no bleeping at all.It's a design fault so go back to the lab and design it to work as it should.I have lots of work to do with de...