Pocolashon,
Electronics may buzz on startup to a very minimal degree. If it's loud, then I would definitely suggest you have a service tech take a look at the issue.
--HDTech
Dear supporters, users,
I bought a Samsung LE32A656 LCD 3 days ago. I have read about all possible noises and buzzing coming from the back of the unit but I did not find the answer for my problem:
I hear noticeable buzzing after I turn the unit on. This noise goes completely away in approximately 5 minutes (then I hear only silent sound after putting my ear close to the back of the display).
Is this behaviour normal? May it go worse later?
Thanks!
Kind regards,
P.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic