|"nothing displays on the monitor either"|
If you don't get the POST beep, you're not gonna get a display on the monitor.
"What other details do you need to know?"
How about your system specs in detail?? Make/model of board, model of CPU, amount & speed of RAM, make/model of video card, make/model/wattage of power supply? Have you made any changes lately that may have caused this problem?