Set top box not connecting to TV through HDMI port

[sentinel]

I have tv model number philips 42PFL7977/V7

I am struggling from a strange problem. The set top box is not able to connect to TV through HDMI port and shows the message no signal.
But when I connect Amazon Fire stick on the same port it connects perfectly.

Can somebody help in this regard.
I tried this with two tatasky set top boxes and one airtel set top box, to check if the issue is with STB.

Thanks and regards.

 

[petes]

Can you check HDMI cable? suspecting this could be faulty.

 

[sentinel]

I bought an old airtel HD set top box. It worked.
New set top boxes Airtel and tatasky not working. Don't know the reason.

Amazon Firestick works on the same HDMI.