Question System does not boot

[valneq]

I recently moved from Europe to the US and sent my desktop PC tower in a well padded parcel.

Before sending it off, my PC worked fine. Yesterday it arrived in the US and I checked for visible damage but there was none.

Nonetheless, the PC does not boot: the fans don't spin, the lights stay off, no noise. And obviously also no display output.

When I turn on the PSU's power switch, the motherboard briefly flashes white. When I switch off the PSU and on again after a short amount of time, the motherboard does not flash. Keeping the PSU off for longer and switching it on later, makes the motherboard flash white again.
The flashing LEDs are part of the RGB lighting of the motherboard. These LEDs used to be orange under normal operation. I don't think I ever messed with the RGB color setting.

But the regular power switch to boot the computer does absolutely nothing. Not even the status LEDs of the motherboard (for CPU, RAM, ect) show any activity.

I checked the PSU's manufacturer's website for a quick PSU test: short circuiting two pins from the cable going to the motherboard's 24pin connector does make the PSU's fan spin. This is supposed to indicate that the PSU should be OK.

How do continue I troubleshooting the problem? Is the PSU really OK?
Unfortunately, I don't have any spare parts here to test things with.

System Specs
Case	Fractal Design Define R6
PSU	Seasonic FOCUS Plus 650 Gold
Motherboard	Gigabyte X470 AORUS GAMING 5 WIFI revision 1.0
CPU	AMD Ryzen 7 2700X
RAM	2x G-Skill Ripjaws 16GB DDR4-3200
GPU	MSI Radeon RX 580 ARMOR 8G
NVMe M.2 SSD	Samsung EVO 970 256GB
HDD	2x Western Digital Gold 4TB

 

[kaehligj]

Well the only difference would be you moved from 230V (240V) 50Hz power to 120V 60Hz power.
That is half the power input to the PSU.
Not good if the PSU is not specified for 120V operation (universal power input).

 

[valneq]

The label on the PSU says:

AC INPUT: 100 V – 240 V 9–4.5 A 50–60 Hz

So I guess this should not be the cause of the problem.

 

[kaehligj]

Nope - the problem lies elsewhere.
Except half the input voltage would require double the current from the PSU's internal mains rectifier.
And THAT could very well be the problem revealing a tired PSU.

 

[valneq]

I connected only the fans (3x case fans, 1x CPU fan) to the PSU, and short circuited the motherboard signal on the 24pin connector for the PSU. Upon turning on the PSU, all the fans start spinning.

Then I added the CPU, GPU, and SATA power cables, in addition to the four fans.
Powering up, again makes all the fans turn, the SATA HDDs make noises and vibrate.
The CPU and the GPU show no sign of activity. But since they are connected to the unpowered motherboard, this is probably expected.

 

[valneq]

Except half the input voltage would require double the current from the PSU's internal mains rectifier.
And THAT could very well be the problem revealing a tired PSU.

A couple of months before moving the the US, I had a problem with my PSU and replaced it. This one is just a couple of months old. Can it be "tired" already?

 

[kaehligj]

I'm out of guesses now ..

 

[valneq]

Don't worry. I will sort this out. Maybe with the help of a service technician.
But in any case: my computer will boot again!