Fans come on but system wont boot

an MSI 740gtm-p25 mother board. fans and light come on but no beeps or video signal.
i bought a new 400 watt power supply. still doesn't work.
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More about fans system wont boot
  1. Give more details, is this an old system that quit working? or is this an update of an older system?
  2. fairly new system i got it last year. bought a bare bones combo mobo, processor, ram, and hard drive. it worked until now
  3. What made you decide to buy a new power supply? Please list make and model of power supply. Also reseat the memory and the video card (remove and reinstall).
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