Sorry for double post, but I found this
This was posted on another forum in response to a similar question for an ECS board, and the poster said that he sucessfully looked up his beep code on this table. So I'm guessing Award/ECS are either the same thing, or use the same beep codes.
You said that, 'thesound repeats' after that 13 seconds'. According to that table that means:
Originally Posted by Beep-Code Table
Either the CPU is not seated properly or the CPU is damaged. May also be due to excess heat. Check the CPU fan or BIOS settings for proper fan speed.
Hope this fixes it