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TAS2770EVM: No sound output

Part Number: TAS2770EVM

I connected 2770EVM to my computer, and seems the power supply to it is normal, the computer can recognize it. but no sound out, if I put my ear close to the speaker, can hear idle noise

this set up works in my China colleagues' computer

I can play music on my computer's speaker. after I changed it to TI USA audio, it no sound
If I put my ear next to the speaker, I can hear a little idle noise.