Question CPU debug LED permanently on+no boot problem with restart loop sometimes but a bit more peculiar

[synt4xie]

My system:

Secondhand R5 1600
MSI A320M Pro VD/S
16GB Gskill 2666 mhz
Antec Atom B550 550w (older PSU - corsair 450w, worked great for 4.5 years, didnt go bad)
240GB SSD, 1 TB HDD

PC is connected to a UPS, 600va 230V.

All parts except 1 stick of ram, PSU are close to 5 years old. The pc worked completely fine for a month before it started to go into restart loop one day (Windows updates disabled). After happening twice PC booted. Worked fine that day including 2 shutdowns. Next morning, it went into 1 restart then didn't boot with the CPU debug LED on permanently. After unplugging accessories and holding down power button (you know the drill) it booted normally, and ran well for the day including 2 shutdowns. This morning, it refused to boot. CPU debug LED permanently on. I reseated ram, checked with 1 ram, to no avail. This evening, I tried to boot again, this time the debug LED was VGA. And funnily enough this time, the instant power button press restart worked (it didn't this morning). After restarting this way thrice, it booted. Again went to a restart loop. This time, CPU LED blinked twice, RAM led came on in one loop, restarted from wall outlet during CPU led on.

My question is, what is going on? Is it the PSU or something else?

EDIT: After I have unplugged all accessories and then plugged them back in after windows boot, it's currently running for well over 30 mins without problems.

EDIT: It has now ran over 2+ hours without shutting down or restarts.

 

[Ralston18]

This:

"Antec Atom B550 550w (older PSU - corsair 450w, worked great for 4.5 years, didnt go bad)."

May be "going bad"..... Likely at or nearing its' designed in EOL (End of Life).

Especially if there is a history of heavy gaming use, video editing, or even bit-mining.

All important data backed up?

Check Reliability History/Monitor for error codes, warnings, or even informational events that occur just before or at the time problems occurred.

 

[synt4xie]

This:

"Antec Atom B550 550w (older PSU - corsair 450w, worked great for 4.5 years, didnt go bad)."

May be "going bad"..... Likely at or nearing its' designed in EOL (End of Life).

Especially if there is a history of heavy gaming use, video editing, or even bit-mining.

All important data backed up?

Check Reliability History/Monitor for error codes, warnings, or even informational events that occur just before or at the time problems occurred.

I am going to try using my older psu for a while. I didn't see any issues from the older psu and the overall total power usage should be similar - I used ryzen 3 1200 instead of r5 1600 on that, everything else is same. The atom psu was used for 3 years prior to this - could be going bad as it was warrantied for 3 years.

Heavy gaming? Yes. But I mostly played csgo which didn't really push everything to their limits, with occasional AAA games. Video editing & mining, no.

I only have 6~ gb of very very important data which is backed up to my ssd & gdrive and a usb drive is arriving on Sunday.

I will try to update what happens after Sunday.