Using Logic 9.1.8, Mountain Lion, experiencing "static" during midi use, any thoughts?

Recently purchased logic studio. Installed the 9.1.8 update and am running Mountain Lion.
For some reason, I am experiencing a "static" crackling sound when using the midi instruments, even when I am not recording. As far as I've noticed, it is not occuring during audio recording or playback. I recorded a quick track with the computer mic, and didn't notice anything, and I dragged a random audio file in to see if it would static as well, but no. A couple of times a warning popped up:
Sample Rate 40575 recognized.
Check conflict between Logic Pro and external device.
This happened first when I tried to record a midi track. Then it happened again when I tried to record an audio track with the midi track. I deleted all of the tracks and did the same thing again, and the warning did not appear those times.
Funning thing is, I don't have any external devices connected. I am still very much a beginner with Logic, but have done several projects with it in the past and have not experienced this problem. I'm not exactly sure what this warning means.
I also double checked to make sure there wasn't any outside interference, I disconnected my computer from my speakers and unplugged my sound system just to make sure my speakers weren't messed up, and it still crackled. I used iTunes to see if it was happening there, no static. I've gone through and made sure I don't have any excess programs running, just logic and preview, still static with midi. It will crackle even if I am NOT RECORDING and just goofing around. When I play the track, it will have the identical crackling experienced while playing.
A little frustrating, as I've been anxiously awaiting this purchase. Please, if you have any thoughts or suggestions, I will check them out.
Thanks.

Thank you for the suggestions.
I had previously tried all of the above but the airport/wireless thought. Unfortuneately, none of these things made a difference, including the wireless suggestion.
Currently, I am using my Mac's "cheapo" internal audio hardware  (haha). I have a one year old 27-inch iMac,  a good pair of bose speakers, and a polk sub. I don't believe it is an issue with my setup, considering I completely disconnected and unplugged it.
I did, however, do a little info hunting on the internal audio situation, since I was curious what is actually included, and I stumbled upon this interesting little tidbit about my model of iMac:
https://discussions.apple.com/thread/2718054?start=0&tstart=0
I had previously wondered if I was hearing my mouse in my speakers as well (not just in logic). It appears that this model of iMac may have some grounding issues, as someone later in the thread suggested purchasing and using a ground loop isolator, which seemed to fix any extra interference for them.
Ironically though, I have since opened logic, and do not seem to be encountering my previous static issue(yet).
Fingers crossed, hoping that I will not be experiencing it again. Going to purchase a ground loop isolator, and continue to mess around with logic, just to make sure it was not just an internal audio issue with my iMac.

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