fans spin 2 second then stop

Hello, I recently bought some new parts for PC and when I installed them it isn't showing any image on monitor until I disconnect GPU and connect to motherboard. I tried almost everything what I saw on forums, and had no luck. When I turn on PC fans start spinning and then after 1 sec they stop...

Hello , i used my pc for 3 months today i playing games pc is shut but slowly after that i try to start pc but fans spin 3 sec then stop and phase leds light green green orange red Motherboard: GA-P55-US3L CPU: Xeon X3440 Grpaichs card: Gtx 950 Ram: 4gb 1333mhz