using my macbook to record us and it worked just fine.
Built-in microphone? I've done that. I shot a temporary sound track for a TV commercial like that.
How far apart are the ticks? If it's a mono track (one blue wave), drag-select up to 20 seconds of the clicking, export it as WAV (Microsoft) 16-bit and post it here.
Scroll down from a forum text window > Upload Attachment > Browse... If it's stereo (two blue waves) the forum will cut you off at ten seconds.