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No signal on the monitor can be caused by almost anything. Give us some more specifics. (Does the Mobo beep, how many times?) most of the time it has to do with the motherboard having a dead PCI/xpress x16-AGP slot or a dead card. But sometimes the RAM can be at fault, the PSU, the peripherals, almost anything. Try booting with and without the HDD, CD Drive, or Floppy, or combos of the 3. Reseat the processor, RAM, Video card, and every single expansion card you have. Re-plug in the power cables. Or basicaly, take it apart and put it back together. As I said before, no signal problems can be so vast, that's one of the only things you can do to be sure weather it's the motherboard/parts inside. Did you try another monitor?
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