Hey Guys, i need some help. I have a philips lx3000d home entertainment system. The problem is that the video comes on the tv but no sound. I have to leave the dvd player running for about 30 mins and then a loud bang comes from the speakers and then the sound starts coming. Anyone else got this problem?

I aint got a clue what is wrong with it, and practically it's getting on my nerves now. Any help is really appreciated.