motherboard not initialising

well I want to play call of duty ghost but my card ( Nvidia TG 9800 green edition ) is not powerfull enough (dixit Nvidia GeForce experience panel..) so I bought a GTX 770 but once in the pc would not go beyond the " asus logo at the start ..could not even enter bios by pressing " delete ..thought the card was faulty ..sent it back for another
one ...same thing happen ..was told by " ASUS" that it was not compatible with my mobo .. so I got a GTX 660 but the same thing happen ..after some research I got an answer saying that the motherboard was not initialising the card and I better get an AMD card as they would definitely work with my mobo so I am waiting for an AMD Radeon R9 290X......my motherboard is an M3N-HT-Delixe , I have 8GB memory and a Quad core AMD Phenom..
what I would like to know is how to find out why the motherboard is not initialising the card, is my motherboard faulty ( it works perfect with the GT 9800green edition )...do you have any solution for me ...ANY HELP WOULD SO MUCH APPRICIATED
thank you all very much

Additional Details


well the PSU is 1000watt so i don't think it is coming from there


Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit
Processor: AMD Phenom(tm) 9650 Quad-Core Processor, AMD64 Family 16 Model 2 Stepping 3
Processor Count: 4
RAM: 8190 Mb
Graphics Card: NVIDIA GeForce 9800 GT, 512 Mb
Hard Drives: C: Total - 953767 MB, Free - 467801 MB; D: Total - 99 MB, Free - 69 MB; E: Total - 476937 MB, Free - 138652 MB; H: Total - 99 MB, Free - 66 MB; I: Total - 476837 MB, Free - 176318 MB;
Motherboard: ASUSTeK Computer INC., M3N-HT DELUXE
Antivirus: Microsoft Security Essentials, Updated and Enabled