Dell — bad product

Address: Kollam, Kerala

i had brought a dell inspiron 15r n5010 laptop on[protected]
there was some defect with the motherboard and they replaced it on february 2011
and i thought that all probllems were over
but after the warranty was over on[protected]
just one month after that the motherboard started showing defects again
this made me feel so bad that that the replaced motherboard didnt last for one year
what should i do
what kind of products are these companies making