not sure about the Superchannel 24 pin psu you are using but I suggest using a good name brand psu.

also try using a professionally made 24 to 6 pin adapter, although it seems your hand made one should work in theory.

this still does not explain why the same 24 pin psu and same 24 to 6 pin adapter works for 3060 but not 3050.  according to your report the original 3050 psu still works.  I would try replace 3050 cmos battery w a brand new one and clear cmos settings.

thank you all actualy the was nothing wrong about the 3050 board and atx adapter 24 pin to 6 pin that i made is just that the psu i was testing with has issues because when change and using different psu the 3050 worked 100% 

thank you all for comments i love this plartform thanks again you all 

I am not working for Dell but i am a user and dell machines has been my favourite from its establishment till this day 

Anyone who wants modified atx adapter cable 24 pin to 6 pin for  Dell OptiPlex model list 3040,3050,3060,7050 PSU 24 Pin to 6 Pin Adapter Cable pls search me on facebook market 

sample on the image  mine might not look nice like the other one but it works 100% same as for those of professional