New HA Yellow with CM5 | Red LED blinks once, nothing happens

Installation
1

Hello Community

I just bought my first HA Yellow with a CM5 (wireless, 4GB RAM, 32GB eMMC)
I also installed a NVME 2280 256GB SSD.
I set the jumper to USB.

I followed the official installation instructions but when i try to start it in USB Mode the red LED blinks once and then nothing happens.

I tried removing the SSD already without any affect.

Any ideas what i am dealing with or what i could do to troubleshoot the issue?

Many thanks
Simon

2

The cable does work for data transfer with for example my smartphone so I guess it is suitable for the data connection between HA and the PC.

3

I refitted the CM5 module, even though it looked perfectly fitted already.
I switched the Power Supply
I switched the USB-C data cable
I switched the Network cable
I replaced the CR2032 battery

When I plug-in the Power the LED D4 (red) and D5 (green) briefly light up and a quiet whistling is audible when you get very close to the board. Probably indicating that there is power on the board.

I am at a loss as to what else to try :slightly_frowning_face:

4

Turns out the CM5 module had a defect or I damaged it during installation.
Bought a new CM5 module and worked on first try.