Latin at the end here. : cry:
EVC cables are off. Neither the soldering points nor the cables were in contact with each other. Even now the soldering points have no contact. The jammed black cable was only soiled with WLP, not damaged. No bare metal.
The capacitor is on again. Again, there is no contact between the two legs or their soldering points. Thanks specifically to the forum colleague [USER = 309561] @xl_digit [/ USER] for his helpfulness, work and time.
Tried both DP inputs on the monitor and on the card, also crossed. HDMI tried. Cable extensions for the power connection removed. Checked tight fit of the PCIE connector on the power supply unit. Monitor is okay, that's Windows. Was able to boot into Windows yesterday as mentioned with the iGPU.
No picture. After switching on the computer, the monitor shows which input it is set to and does not issue an error message, so it receives at least an initial signal from the card. The board counts through to the post-beep, then the VGA LED (white) lights up continuously and the board says "Daah dit dit dit", which is also VGA. At this point the screen has not received a signal for a while and is already in standby mode.
When no one has a brilliant idea what else to try, I'll pack the card tomorrow and send it to [USER = 42127] @L! ME [/ USER], who kindly offered me that.