Missing pin on the new PSU isn't at the same place

Feb 11, 2019
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Hello to all, I really hope you can help me.
My PSU died so I found a new one in my house that I bought a long time ago...
Problem is: it have 20 pin connector with separate 4 pins and the old one was all 24 pins together (labelled on it as 20+4)... And that 1 missing pin (former -5v) isn't at the same place...
I got all out of the box, connected all that should be connected and when I turn up the computer fans are working, HDD making normal sound, but no signal on the monitor, keyboard or mouse... And no POST, no beeping... Is there any solution?
On that new PSU all wires are there on 20 pin slot and on the other 4 pin slot one is missing while on the old one was one missing but 8th from the begging of the connector...
I would be very gratefull if anyone knows is there a chance for this new PSU to work or it is uncompatible...