STARTING WINDOW desktop and goes off

Hello, I hav a computer with a specification of 2GB RAM, INTEL CORE TO DUO, 150GB HARD DISK and a 32 bit monitor. And i have attached a graphic card named NVIDIA GEFORCE GT 710 ZONE EDITION 2GB 64BIT DDR3 recently and i have installed the required files for the graphic card. And the computer was running good. I have played many games also with tat. And about last 5 days when I switch on the computer the cpu runs the monitor opens till the STARTING WINDOW desktop and goes off. But still CPU still runs. I thought that graphic card is failure and had a idea to fix that graphic card in another computer and then it works smoothly and that computer has a specification of 4GB RAM, i3 Processor, 1TB HARD DISK, 32 BIT MONITOR. Please help me to find out the problem. Thank you