New Graphics card not working! PLS HELP

Lemon275

Reputable
Dec 2, 2015
5
0
4,510
SO... I had an pc with the following specs:
Motherboard Name: Asus P8H61-M LX3 R2.0
CPU Type: DualCore Intel Pentium G2030, 3 GHz
Ram: 4 GB DDR3
IGPU: Intel HD Graphics 2500
Power supply of 300W
And i bought a Nvidia GT730 and plugged on monitor but no signal.(I disabled the IGPU before that). I tried so many things from the internet such as Cleaning PCI-E Slot, ram slot and CMOS Battery slot. I replaced it with same video card from shop... same problem.
I think the power supply is not enough even if on geforce site said you need a minimum power supply of 300W : http://www.geforce.com/hardware/desktop-gpus/geforce-gt-730/specifications
I'm so confused
 
I tried anything just to make my monitor to turn on i also tried the hdmi slot to another monitor but nothing. Im thinking about a damaged PCI-e Slot from motherboard or I dont know.