Here are our recommendations:
1. Test the system without the processor installed looking for a 1-5-4-2 beep code sequence.
2. Test the system without memory installed looking for 3 regular beep codes.
3. Let us know the PBA number for the board you have. This can be found on a white sticker located on the board itself.
Thank you for the reply.
As you recommended:
1) removed processor - same result; green power LED on and no other activity, no beeps
2) removed processor and memory - same result; green power LED on and no activity, no beeps
3) PBA is G62251-407
Looking forward to next steps.