ATT wireless router not working

Power light red and wirelss light green but no other lights. ATT said it was router. Went to ATT store and they said it was power cord but I had to buy the new router to get the power cord. I only had modem for 18 months - it should have worked longer. ATT tech and store person told me at least 8 times it was because of a power surge and I should not have pulled into electrical outlet. It was pulled into a surge protector.

Btw - Best Buy told me they see about 10-20 of these from ATT each week but only about 2 from Charter Cable. I think these are defective power cords the majority of the time and ATT needs to fess up and replace - free of charge!