A moment in Philmusic.com's History: The site domain was registered in December 1996. We are at most, probably one of the longest running Philippine websites around!
Most probably it was a "fake" D'Addario. Most fakes have stainless steel strings inside (1, 2, 3). These stainless steel strings can't be pulled magnetically by the pickup's magnet thus the weak or almost no sound.
Where did you buy the strings?