Question Computer turns on, but no POST and keyboard/mouse are off ?

[DarkDreamSan]

Hello, about a year ago I bought a custom built PC (it was my first time) and the PC was working as usual from then on. After my usual office work at night, I switched off my computer and went to sleep, next morning the PC did not POST, with black screen on monitor, and keyboard and mouse having no light. There is no beeping sound. I have one fan that was connected through molex, seems to not work and the one fan connected directly to the motherboard is dimmed with fans on very rpm while the other one is working fine, CPU fan seems to work alright as well. The graphic card fans are also not moving.
This thing happened to me once or twice before and all I did was turn it off completely and 30 sec. power button hold and it seemed to boot fine after that, but not anymore. Please anyone can help?
Spec:
CPU - AMD R52600
Motherboard - Gigabyte DS3H-WIFI
RAM - 2x8GB Corsair CL16 3000 DDR4
GPU - Zotac RTX 2060.
PSU - Corsair VS550.
Dual Boot, Windows 10 Pro/ Ubuntu 18.04

 

[Lutfij]

Welcome to the forums, newcomer!

The VS Series isn't a reliably built PSU. I'd see if a donor PSU that is reliably built, something that's higher in tier than the VS, like the CX or TX units and see if the issue persists. You could also try and disconnect from the wall and reseat the sticks of ram, the discrete GPU and or the CMOS battery. See if that helps.

 

[DarkDreamSan]

Don't know why it happens but, had it turned off for an hour or so, now it's suddenly working fine, ran some benchmarks and stress tests, and is working fine.
Everything working fine now even the fans.
Unfortunately the time when I bought a desktop, I needed it urgently and was tight on budget, and country where I live, Corsair usually sells vs series, while others are sold on a very high margin compared to other countries.
Is Corsair CV Series any good or Gigabyte GP-P550B?
Finally, Should I still ask Corsair for an explanation or ask an expert in case this thing happens again?

EDIT: Just checked for prices and a Corsair CX 650 and R5 2500 costs the same.