Latest update:
- Went to NSC in the morning, they also could not revive the D300 & they also had no idea what was wrong
- They were unable to do 1-2-1 exchange
- But I explained nicely that it was purchased less than 2 weeks back & asked if they could do anything to help
- The CSO left his desk & contacted the salesperson for the shop & came back telling me that the salesperson will discuss with the shop to arrange a replacement
- In the evening, I went to the shop & got a swap

- Now, I just hope it is not another lemon *fingers crossed*
So far, all is well for now. But, I think I have been extremely lucky in this instance. If it happened after 2 weeks, I'd probably will not be able to get a replacement.