Question PC boots normally but no beep sound. Sometimes doesnt recognize boot device and sometimes no signal on the display when booting

[PetR20]

Hello.
So it first began with my PC not recognizing my boot device on startup. Then the same day I noticed that my PC is throttling during gaming. Now always when it boots there is no beep like it used to do and sometimes my monitor doesn't get a signal and the light just blinks.
Since then I've updated my bios, reinstalled windows, switched ram and booting only on 1 ram, put a pressure on the cables if they came loose, changed cmos battery but the problem still persists.

CPU: Intel i5-9400f
CPU cooler: stock
Motherboard: asus prime h310m-r
Ram: Adata 8GB Kigdston 16GB 2666hz
SSD/HDD: Toshiba PC P300 1TB
GPU: Nvidia 1060 GTX 6GB
PSU: ig 2650 sixtus 600w
OS: Windows 10

All components are 4.5 years old except for HDD that is 2 years old

My suspect is the PSU loosing power

 

[Lutfij]

Welcome to the forums, newcomer!

PSU: ig 2650 sixtus 600w
That does not look like a reliably built PSU.

My suspect is the PSU loosing power
Source(borrow, not buy) a reliably built PSU that has 550W of power at the entire system's disposal. If the system boots without an issue, then you've found the culprit.

Moved thread from Motherboards section to Systems section

 

[PetR20]

Will try that