Led 1 and 2 only after repaste cpu and gfx

I’ve just did a repaste of the cpu and gfx and put my imac back together. Nothing happens now and the mac seems to be dead. When I check the leds i see the following:

LED 1: green

LED 2: only blinks once when turning the mac on

LED 3: nothing

LED 4: nothing

i know what the leds mean and i found out its either the psu or the logic board. What i dont see is someone with the exact same led behavior, where led 2 blinks once.

Does anyone know what that might mean?

-edit-

pulled out the sintech nvme adapter and reassembled the machine. Now led 1 and 2 turn on and also the computer. But no screen and no led 3 and 4

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