Chefuru okwuntughe gị?
Chezọrọ ahambanye gị?
Mgbe m ofufe ọ bụla ndabara fsx Boeing 747 m nwere ike ghara inwe ụda (engines, njikwa, ...).
M na-agbalị Malitegharịa ekwentị ihe niile ma na-arụzi FSX na CD-ROM ma ọ dịghị ihe na-enyere aka.
Ọ a mara otú idozi nke a?
Biko Banye or Mepụta akaụntụ isonyere na mkparịta ụka.
When any other aircraft are providing correct sounds I presume the 747 sound files are corrupt or your sound.cfg is missing or empty in your Sounds folder of the 747....
Also check if you didn't hit q accidently which mutes the sound in FSX.
You can try to download a third party sound pack (there are many free ones) and see if you like them...