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I brought new components and put a computer together. I installed Windows 7 (32-bit) and everything was working as it should. However my case came with two USB3 front ports I could not connect because of motherboard did not support USB3, so I swapped out the board for a new motherboad with USB3 connection.

Now I put everything back together but it won't bootup.

  • "Memory Ok" light stays on.
  • Motherboad LED is on.
  • There is power, all fans are on but I got no display.

There is no activity in back of the systems, none of the peripheral connection in the back are working.

I have tried the following but to no avail.

  • Reboot multiple times
  • Unplug power and plug the power back
  • Reset the CMOS battery, let it stay out for 10 minutes or more.
  • Unplug all peripheral device but no luck
  • Reset memory, nothing happens

The only thing I did not do was remove the CPU, but I unplugged everything else.

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What does the motherboard manual say about the Memory Ok light being on? – Mark Allen Oct 10 '12 at 3:50
Memory Ok light on indicate DIMM incompatibility for the motherboard. I am using DDR3 KHX1600C9D3K2/8GX, (2x4) acccording the memory QVL it should work. – Reggie Oct 10 '12 at 4:30
Then one or more DIMMs have probably gone bad. :( I wish that weren't the case. Some motherboards have a "Any memory will work" option, with a special button on them that you can hit to enable it. You could try that, and try reseating the DIMM(s) again but other than that you may need new memory. Good luck. – Mark Allen Oct 10 '12 at 18:09

I use one memory port at a time and found tha two of the four DIMM's ports were bad. I return the system board and get one that work.

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