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#61
I thought I'd make a quick account to reply with my solution to this as I'd been suffering the exact same issue on a generic PC tower build.
For me it was actually caused by gmail of all things. If I have a gmail tab open in Chrome I get the blue circle blink next to my mouse pointer about every 5 seconds which is highly irritating. As soon as I close the gmail tab it goes away, so I presume that is probably related to gmail's automated mail check.
This is happening on my other machines as well - 1 is a laptop running W7 and the other is another tower running W8.1. If gmail is open on a tab on any of the 3 different OS's I get the blinky blue circle.