Duh, replying to my own post..
So it is taking 21 seconds from power-on to POST. Googling around I see
that the usual time taken is around 10 seconds. So observed the POST
carefully and I could see the values EB, 5A , 69 clearly.
69 --> Reserved for future use (for new busses).
Any one have an idea what could this be for D510MO ?