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If there is no display on the monitor, then your computer is not sending a video signal to the monitor. This could be caused by a bad video card or some other hardware problem. I would open the case and disconnect all the devices (hard drive, CD, etc. Leave only the CPU, memory, and video connected. You could leave the keyboard and mouse connected too. If your computer then starts, you can start to add devices (after turning the computer off) one at a time. If this doesn't work, then you are looking at replacing the motherboard or just the video card if that is possible.
if your computer does not have mouse and keyboard markings it is possible you have them switched. I have seen computers that color code and mixing brands of keyboards and mouse's will confuse you when you get them switched around. Both plugs look the same but will only work in the correct spot. If this is not your problem, and you have usb stuff then.. It is possible that there is something wrong with your on board usb. if your keyboard does not have any lights that come on then i would try adding in a usb pci card for now. Press caps lock button to see if the light works. also number lock.