It is correct. Pins 11-13 are the only ones required to turn on/off the board.
I would also consider testing the board in a non-conductive surface to eliminate any possible grounding issues. Also, please remove non essentials components such has hard drive, optical drives, memory.
Are there any LEDs lit on the board itself?
Feel free to reach our Contact Support Group for further assistance.
The lights you indicated tell us that the unit is getting power and that it is ready to post. If you already jumpered pins 11-13 properly then it is possible that you may have a defective board.
You may follow this guide to decode errors on your system:
I am including the link for our validated processor list to make sure the processor model as some models have requirements.
You should be able to remove the processor of the unit and at least get beep codes when attempting to turn on the board. If this is not the case, you should consider contacting our support center for warranty replacement.