iMac 21.5" 2.7GHz mid 2011 Will Not Power On

This iMac went on the fritz and the USB ports stopped working. The computer was on and functional while using the bluetooth keyboard and mouse. When trying to restart the system to get the USB port to start working again the computer powered off and never turn back on. Tried SMC reset. No change. Dug into it's guts and replace the logic board (but not CPU, used it from old logic board and made sure it was compatible with the new logic board), and that didn't fix the issue. So I put the old logic board with the old cpu back in and replaced the power supply. Still no change. The computer didn't power back up. Put the original power supply back it in. Made sure all connection were correct. Double and triple checked every connection. Still nothing. Tried disconnect the plug for the power switch and jumping the power. Again, still no change. The logic board continuously shows LED #1 light but nothing else. The computer makes no noise (dings, beeps, no noise from fans) and shows no indication of trying to power on.

What can be the cause of the problem?!

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