New PSU won’t turn on

[Edwardo07]

I just bought a thermaltake smart series 500w PSU and it won’t turn on when i plug it into the wall and turn it on (Fan won’t spin, no led).any help would be great!

[podkall]

PSU or PC? because PSU doesn't turn on just because the switch is on and the power is in

[Edwardo07]

2 minutes ago, podkall said:

PSU or PC? because PSU doesn't turn on just because the switch is on and the power is in

PSU. i thought it would turn on because i saw people testing fans on the psu directly with nothing else. i guess i’ll just wait and then test everything together.

[MarkPol88]

To clarify - you hooked it up to motherboard and turn computer on or just bare PSU?

If answer is you just plugged PSU to the wall socket and it did not turn on, then it is normal behaviour - PSU needs signal from the motherboard to start up (two pins in ATX 20+4 connector need to be joined, I believe).

 

If you meant that computer do not turn on, then there are few possibilities:

- bad PSU (yeah, that happens unfortunately)

- loose/bad connection - recheck all connectors between motherboard, GPU and PSU.

- loose front panel connector - during cable managing or hooking up something else you might have pulled on wires from front panel on switch so check it.

 

 

After OP answer:

You can turn on PSU on its own but it require some janky stuff from normal user perspective, as I stated above, so probably wait for rest of the system.

Edited December 29, 2023 by MarkPol88
OP answered before I posted my message.

[Edwardo07]

1 minute ago, MarkPol88 said:

To clarify - you hooked it up to motherboard and turn computer on or just bare PSU?

If answer is you just plugged PSU to the wall socket and it did not turn on, then it is normal behaviour - PSU needs signal from the motherboard to start up (two pins in ATX 24 pin need to be joined, I believe).

 

If you meant that computer do not turn on, then there are few possibilities:

- bad PSU (yeah, that happens unfortunately)

- loose/bad connection - recheck all connectors between motherboard, GPU and PSU.

- loose front panel connector - during cable managing or hooking up something else you might have pulled on wires from front panel on switch so check it.

oh ok, i just plugged it into the wall and expected it to turn on lol, so i only need a motherboard to test this or does the motherboard need the cpu also?

[MarkPol88]

5 minutes ago, Edwardo07 said:

so i only need a motherboard to test this

Technically motherboard might turn on PSU without CPU but I think it may depend on the chipset/motherboard manufacturer. Better someone more knowledgeable than me clarify this.

 

You would still need to hook up front panel connector power switch to turn on motherboard.

As I said - if it is new, I would wait for rest of the parts and do test boot of everything plugged in.

[paddy-stone]

49 minutes ago, MarkPol88 said:

Technically motherboard might turn on PSU without CPU but I think it may depend on the chipset/motherboard manufacturer. Better someone more knowledgeable than me clarify this.

 

You would still need to hook up front panel connector power switch to turn on motherboard.

As I said - if it is new, I would wait for rest of the parts and do test boot of everything plugged in.

Yeah depends on chipset, some mobos are able to update bios etc without cpu/ram, but TBH for testing purposes I don't think it's worth bothering... just wait for entire system and do a system test out of the chassis if possible. Worst thing is taking all the time and cable routing etc and then finding out your mobo or cpu or something is DOA. Even almost 30 years in I still do a bench test of components when doing a full system build/rebuild.

A few years back I skipped doing a testbench, heartbreaking when you have to remove almost the entire system in the end to send a part or 2 back as DOA... makes you remember for the next few times though, lol

[--SID--]

At first: why do you buy a junk PSU?