Update.

I chatted with Dell online CS and they arranged a technician to come and fix my laptop cover. Smooth and fuss free process, i am glad. 

The technician told that this problem was due to the design of the nuts on the cover. Only the first batch of Inspiron is affected and the subsequence ones are an improved version (for the cover). My new cover is the improved version, so wont have the same problem in the near future (i hope).

 

So if you face the same problem, call Dell, they will keep to their service promise, no worries.

Please read the Dell USA hinge/hinge assembly policy.

If the laptop hinge or hinge assembly fails while inside the purchased warranty period;

If still under warranty, click the "Get help now" icon on the right to start a live chat session

The Get help now agent will first verify the Service Tag purchased warranty and ownership. Then they will troubleshoot with you. They will investigate the issue to verify that the failure was not customer caused damage, abuse, misuse, or accidental damage. At our discretion, Dell may or may not replace the hinge and/or the hinge assembly, or any other plastics, depending on the findings of the investigative process

If the system is covered under Accidental Damage Service  the hinges may be repaired 1 time per calendar year.

If the purchased warranty has expired, you will need to pay for Dell service using our expired warranty service offering.