LED Radxa Zero (1GB) keeps blinking, unable to boot

Hey all,

Last week I bought 2 Radxa Zero’s (1 GB, no eMMC). I have however problem with booting one of them
If I power it on, the led start blinking and nothing is displayed to the screen. Where the other (correct) Zero shows a continuous light and outputs something to the display.

Both zeros are the same revision (v1.51) and are powered with the same power supply, sd card, boot image and screen but they behave differently.

The LED even blinks when I power it on, without display or sd card (where the other Zero shows the continuous light).

Could anybody help me with this problem? Do you think I can solve this somehow, or that it’s a hardware related problem?

Thanks in advance!