a320m-hdv - can't pinpoint the problem

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   So in mid-2018 i bought an a320m-hdv and it worked fine but with some USB problems (my usb wifi antenna couldn't be recognized by W10, then the same with my 1tb Seagate external drive and finnaly with my keyboard). But this isn't the real deal.

In December 2019 I travelled and left my pc at home but when I got back it wouldn't turn on. I removed everything and installed again and nothing, the only thing that i noticed was the usb ports that had energy still. No psu fan, no cpu fan and not even the case fan worked. So i thought to my self "must be the PSU (cx650)". Now, only this month i could buy a new PSU (aerocool kcas 500w) and when i installed voil?, it worked! But then, after 2 hours using it I turned it off (after a new w10 update) and the next day it didn't worked. So here I am close to buying a new motherboard and ditching the a320m away. 
I really need some help.

ps.: i found a really similar problem online but with other asrock mb model. (https://forums.tomshardware.com/threads/pc-wont-turn-on-but-usb-ports-have-power.2175736/)

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clauvlg Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 06 Jun 2020 Location: Brazil Status: Offline Points: 3	Post Options Post Reply Quote clauvlg Report Post Thanks(0) Quote Reply Topic: a320m-hdv - can't pinpoint the problem Posted: 06 Jun 2020 at 6:32am
	So in mid-2018 i bought an a320m-hdv and it worked fine but with some USB problems (my usb wifi antenna couldn't be recognized by W10, then the same with my 1tb Seagate external drive and finnaly with my keyboard). But this isn't the real deal. In December 2019 I travelled and left my pc at home but when I got back it wouldn't turn on. I removed everything and installed again and nothing, the only thing that i noticed was the usb ports that had energy still. No psu fan, no cpu fan and not even the case fan worked. So i thought to my self "must be the PSU (cx650)". Now, only this month i could buy a new PSU (aerocool kcas 500w) and when i installed voil?, it worked! But then, after 2 hours using it I turned it off (after a new w10 update) and the next day it didn't worked. So here I am close to buying a new motherboard and ditching the a320m away. I really need some help. ps.: i found a really similar problem online but with other asrock mb model. (https://forums.tomshardware.com/threads/pc-wont-turn-on-but-usb-ports-have-power.2175736/)