I bought a new gpu (MSI Ventus XS GeForce GTX 1660 6GB GDDR5)that requires 8 pcie slots and upon looking at my psu it had only 6. Despite that I inserted my gpu and plugged in the pcie. Of course, it didn't work so I bought a new power supply (Corsair TX750). Everything turns on except for my monitor. I've tried using my previous gpu but nothing shows up on screen. Could there have been a blow when my gpu took power from my old psu? Please help!