No boot, no nothing. Only the fans run when I power up. I tried this 350w in another pc using a 250w and it works. If not the power supply then what? I also installed new motherboard. All of this after I flased bios. No boot now. Is processor damaged? Thanks for assistance in advance.
Unless its an ancient MB you should be able to call the MB manufacturer and have them ship you a new flash chip for around $15. I buddy of mine gave me an ABIT board he fried the flash on, so I called ABIT and they shipped me out a new flash chip right away. Popped it in and all was fine again. There shouldn't be a need to send the entire board back.
I would suspect a bad flash first. Which mobo do you have? A lot of companies built in some kind of boot-block inside the BIOS that can't be changed and allows you to automatically flash the BIOS with a floppy with the right BIOS file and some other files, check the manufactuers website for instructions.
Oh, and also try resetting the BIOS.
My dual-PSU PC is so powerfull that the neighbourhood dims when I turn it on