Mobo or psu or another problem?

Opened my pc last week then nag timpla ng kape. Pag balik ko, no diplay but fan's still spinning and lightd are on. Tried every trouble shooting listed sa google: removed and tried rams one by one, cmos, removing gpu, reseating everything needed to be reseated, changed cpu (5600 to 2600), walang gumana.

May power, but not booting/no post. I have a gigabyte a320 mobo and i know na may boot sound when powering on ang system but i dont hear it now. Wala rin error sounds na binibigay at all talaga.

When i went to a pc shop, tech said na sa psu ang prob. Nag lolow power daw siya kaya di nag boboot and tried another psu, nag boot daw siya. When i got home, tried my used but still working psu, still didnt work. Had power, no boot. (coolermaster mwe 750w bronze to generic 500w but still working just to try and use pc)

Just wanna know if i have to buy a new mobo or psu? Or if there's still a part i need to consider? Thanks in advance guys