I've read somewhere that the sound goes away after a few days. If you're still worried, call up the service center to send someone over to check it out. Here's the contact List for customer service centres in m'sia.

Maybe the engine is running and ur tamper glass, vegetable rack is shaking inside when the fridge inside is 100% empty.
i got the same problem, try to put some 1.5L water bottle inside and try again.

if 30 minute the sound dont go off, i already reported a case. No need to wait. No harm to call and ask. We as consumer has the right.

Yeah...
I think ur issue was, u heard of "Hoooom.... Hoooommm.... Hoooom" sound right?
my one is hitachi 600L, the sound louder i think, after that i found out put some water bottle inside press it down then lesser noise.