Hello, after i got nearly crazy i want to share what helped me!
After disconnecting the Cloud from Power it booted with constant red led.
I tried all to fix it and at last the hard disk was not recognized by my pc anymore.
So i dissasembled the logic board and found out that the connection between hard disk and board was black coated so i cleaned it and now it’s all fine!
Can’t believe it but it was just a faulty connection