Here are our recommendations:
- Test the system on a minimal configuration out of the chassis. Remove all memory looking for beep codes and start adding each memory module individually.
- Clear the CMOS battery for 30 minutes.
- Try a BIOS recovery test with minimum memory installed:
- If the issue persists, check your warranty options to replace the board.
I had the same problem, tried change memory and processor, till power supply.
The post code change to 15 when used a i5 processor, no beep but no video too.
I made video to see the sequence from post code and leds.