My computer powers on but doesn\'t boot to BIOS or Windows. Motherboard light co

My computer powers on but doesn't boot to BIOS or Windows. Motherboard light comes up after powering the system on and all the fans also run fine. Its just that HDD light doesn't come up at all and the power light on monitor blinks constantly. I have already tried swappng the RAM to different slot which too didn't work. When I took off the RAM and powered the system on , it started giving Beep sound which makes sense that MB is OK at this time. Please advise.
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More about computer powers doesn boot bios windows motherboard light
  1. Unplug all things in cpu and plug-in again. Also check your system with another RAM.
  2. The same problem occured on my mobo p4b533 last week, I just unplug my memory and plug in again....it did work..great!! try it....
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