Optiplex 390 mini tower pc compatibility with corsair psu

[Oussa159]

Hello,
I face a problem when i use my atx corsair psu in oem dell optiplex 390 motherboard, i plugged the 24 atx connector and the 4 pin for cpu ( actually i have 8 pins but i split it in two) the light orange show up but when i turn on pc, there's no signs of anything, cpu fans doesn't turn at all, i tried many times but no result, however when i use an old matx hp psu 300w it work fine, pc turns on, so you will said that the problem is from psu but it isn't, i try this corsair with other pc and it works fine, so that's true there are psu which are no compatible with some motherboard?!