Ill try to check with this guy with a good pc to see if the 750ti gives flckering connected to several monitors, if the result is the same then is most likely the 750ti was faulty before my friend lent it to me and all was a coincidence, if it doesnt flickrs like my system does then the mobo is the one giving problems.
In this moment is almost impossible to me to buy new parts cause i am short of cash, the 1080ti most likely is dead so the reason to my black screen is the gpu, however i still want to know what really happened that killed my gpu so i can decide if i should just buy a new gpu when i manage to save some cash (they are really really expensive at this moment) or if i will need to replace mobo first which at this point is probably better to buy a newer mobo cause mine is already old (asus rampage extreme iv) which means i will need to change the processor and ram too(more cash)
Ill probably take some days to be able to try this as i need to ask this guy when he is available but as soon as i confirm what was the result ill let you know.
could you please help me choose a new set of components, newest technology one but at medium range in case it ends being the mobo the faulty one.
Mobo
Cpu
Ram
Thanks everybody for your time and patience.