Question Asus z77 blinking light but pc doesnt power on

Navy

Reputable
Nov 4, 2020
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So I had a few problems and Im seriously thinking of using my backup mobo because I can only get a new pc later this year. As soon I plug the power cable the mobo starts blinking ,a yellow blink to be more specific and i try to power the pc on and nothing happens, I had the 3 short beep problem but i solved it by cleaning the ram and the mobo but after starting the pc, then i would get no image and changed the cmos battery and it worked, theni would reach the lockscreen and pc freezes. Any ideas?

Thank you for your time
 
The letter under the light read sb_pwr which I think that means standby power but what should I do?