That plug is not avr, it is basically a cut-off switch where if voltage falls below min or exceed max level then it simply turns off until voltage drops within the expected range. A true AVR corrects this by reducing max voltage or boosting low voltage to maintain a good range voltage output.I'm not sure if putting an AVR before the UPS is a good idea.
No that is different, it is a traditional surge protector.
I bought this to check my old Corsair hx620 and it shows all other lights other than 5v light. Then I used it to check my previously working i3 PC's power supply. Again 5 v light not turning on. Then I thought device itself not working and asked for a replacement from Amazon.Get something like this
Easiest way to check if your PSU is correctly working, and supplying clean power.
Although, lying idle for 10 years, doesn't sound ideal.
In the attached pic the +5v led & 5VSB led are on though.I bought this to check my old Corsair hx620 and it shows all other lights other than 5v light. Then I used it to check my previously working i3 PC's power supply. Again 5 v light not turning on.
Ignore it, as long as +5v & 5vsb led are on then it is fine. Actually, I don't suggest such psu testers anyway. The best way to check a psu is by actually using it to boot a confirmed working motherboard with processor installed.-5v no idea what these represents