Am using the ga g41 es2l with 2GB of RAM, but suddenly it does not display anymo

Did you reset the bios first? Try with only one ram card in slot 2.

Yes i did reset the bios by resetting jumpers but can not know if it worked since there is no display

Do you use onboard video ??

yes am using on-board, but have tried with a working video card from my second pc but still no success

Did you have a graphics card on your current build or were you using onboard video?
Try staring without a hdd. Try a different video cable. Is anything displayed on the monitor like no video input? Are the motherboard giving of any error beeps? Does the fans and lights power up when you switch on the computer?