No audio input signal

Hi forum,
Thanks to everyone who tried to help. I thought you’d like to know - a computer engineer came round and identified that the fault was not with cubase but the computer. He ran a test and found no sound was going into the pc, but when checked with another computer it was fine. He’s going to install a new motherboard. To check if sound is coming into the pc, on mine it’s Start - Programs - Audio Video - Sound Recorder - Sound Recorder. I didn’t know about this and thought it must be a cubase problem. Regards, Barry.