Hi Cauzomb

Problem not yet resolved.
To be honest with you, due to limited knowledge as far as hardware is concerned, I am still in the dark and as a last resort will have to acquire somewith experience to take a closer look.
I opened up PC and no wiser as to exactly where the noise originates. All I can say at this stage is that the fan is constantly running even though CPU usage varies between 1% upwards. It is forever fluctuating.

Will let you know in due course how things turn out.

Tks