HDMI Out not Working?

I just bought WD TV Live yesterday, intially it worked with HDMI out with my 32" Sony Bravia Full HD.

But today its not. Its just giving a black screen, though its working with composite out.

Should I do anything at my end before calling in for replacement?

Try it on another TV

Try a different HDMI cable

Try a different device on that TV

Thanks janry for your reply. Have tried with 3 LCD’s & 2 HDMI cables, but no luck.

If you have tried different TV sets and cables, then you have a bad HDMI port. Replace the device.

Thanks oxter for your reply.

Have logged a RMA.