Cannot display anything at minitor

Check the vga connection of your monitor from your motherboard, be sure that it is properly connected. Check also the power cords of your monitor, be sure that it is properly plug. If still no display, then we have to do the hard way. Open your computer casing where the motherboard lies in. Remove the memory card and clean the pins of it by using an eraser of a pencil. Remove also the expansion video card if you have. Reset the BIOS,(to do this refer to the motherboard manual). Plug in again all the remove items from your motherboard, memory card and video card). Close the casing and then power on. If still no display then take your computer in a computer repair center in your place.