Weird power / sleep behaviour.

My Macbook Pro does not power on anymore. I need to disconnect the battery for a while and plug in the magsafe adapter, then it boots up (power button still not reacting).

Other strange behaviours:

- does not go to sleep when closing the lid

- wakes from sleep when closing the lid while sleeping

- led on front is off when running and on when sleeping

The power button is not broken (works for switching off). Battery is ok as well (power can be disconnected once running).

I already tried to reset VRAM and SMC (not sure if that worked because i could only do it with a restart since power button does not react).

I reinstalled OS on a brand new SSD and changed the memory to known working modules.

Glad for any hint on what might be broken. Could it be the DC IN board?

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