Thank you for the fast answer. I checked the Ram (changed with working one from another computer 72Pin Edo Ram), at least there must be a boot screen with the Logo “be”, but there is nothing. Only both LED Stripes lightening up and staying like in the image. Could it be possible, that the boot Rom is faulty?
Even without a Harddrive there must be something on the Screen, i also changed the GPU with another compatible PCI GPU from the compatibility list. But no reaction. The capacitors look at the first sight okey, but i can try to change them. Best regards