Fatama,
(1) popping sound may be a capacitor going bad..
(2) buy a new 42in plasma or 42in LCD, TV deals will be available most every week this month (Most credit cards give you an extra warrentee of one year, call the 800 number on the back of the card to confirm...)
Ive heard other stories about Samsung HD sets made from 2005 to last year, having cheap, faulty capacitors, which fail after 3-4 years...this is due to faulty, incompetent management in their Chinese plant; (going for the cheap, instead of spending a quarter more, they put in faulty Chinese capacitors to try to save money) Samsung is now in the process of experiencing CLASS ACTION suits in regard to these events, because they not only have failed to correct the situation; but also because they refused to acknowledge this situation, and pay for the repair of the sets. (Faulty capacitors result in the tv set failing to turn on.)
These experiences are quite frustrating; I HAVE heard that Samsung has corrected the faulty Capacitor problems as of mid 2010...but who knows? And yes, my set will probably eventually fail as well, because of these faulty capacitors.