A) Check to see if you have the TV muted (you probably already did). B) If the TV is hooked up to speakers, check all of the cabling to make sure nothing was cut, worn, burned out, etc. C) Knowing that the TV is 15 years old, it might just be worn out. Ive had TV's that our family has put a lot of miles on, and after so much time, they just give out due to use and age.