Left for a few days, returned home, computer wont boot

[Compddd]

Hi, I normally never turn off my computer. I went on a trip for 5 days, so I turned off my comp before I left. Upon returning I press power, and the CPU fans, case fans, sound card, video card fan turn on, but my keyboard, mouse dont power up and theres no image on my monitor.

I've tried resetting my cmos, unplugging everything except my vid card and cpu, same thing no dice

I'm thinking my PSU has run its course in life

Any thoughts, ideas, opinions? Would be much appreciated.

Thank you

 

[AncientPC]

PSU or mobo, only way to find out is to test with a known working one.