Problem in graphics hardware !!!

Jun 12, 2012
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I have a P5G41T-M LX3 motherboard and a nVidia GeForce 9400 GT graphics card of Biostar company. My monitir is Dell IN2020M.
when i am trying to rum my computer without graphics card as i have insert the vga cable into the motherboard's vga port and early i have dvi cable for the graphics card. and by this the monitor shows no dvi cable and when i change that to vga then it also shows no vga cable but when i insert the graphics card it works properly. So pls pls pls help me that how to run it without graphics card ......... Thanks in advance !!!