Its the main motherboard itself which is shot. Apparently, the motherboard had a suicide pack with some other components too. As far as I can tell, the hard drive is OK. However, given a little time, I am sure I will get the PC running again.
The urgency I have today with my CM15A is that it did the old DST change this past weekend. I need to, therefore, reset its clock back to the correct time or my entire life will be off by an hour.