Hi I have what seems to be a mouse click at the beginning and end of voice recordings, I have tried noise reduction, silencing,and also changing mic levels to no avail, I didn’t have this problem when using a desktop PC with same equipment , but noticed it when I changed to a laptop
Using Audacity 2.2.
2 on windows 7
That’s what DC Offset sounds like. Describe the system. Which microphone and how its it connected?
Koz
The mic is 3.5mm frontpanel jack, or a basic pc mic
Connected to the front of the laptop (Toshiba satelite) A200_1s9
@Koz I seems to be ok now when you mentioned DC offset I went to normalise and did some changes the noise click is gone thank you Koz for the clue 
Awesome
That’s because one of the features in the Normalization effect is DC Offset removal (and that feature is on by default).
WC