What is the cause of my MBP coming out of sleep to sound a long low tone and repeat every 5 to 7 seconds?

I put my MBP to sleep with: Paralells, Safari, Sophos, LittleSnitch and smcFanControl running as they are suppose too.
Two hours later I went to wake my MBP and I get a long low tone and repeat it was repeating every 5 to 7 seconds. I had to do a hard power down in order to reboot or get any type of response from the MBP...
Does anyone have any ideas of what this is. This machine is not even 30 days old yet & I am a new comer to the world of MBP's.

Thank you all for the input regarding grounding. This was the problem, but not from a power outlet. The Sure 8900 microphone is has a 3-prong "balanced" connector at the microphone, but then is adapted to 1/8 inch connector so that it will fit the "mic" input jack on the iMac. The result - a conversion of a balanced to unbalanced signal. After describing this to a technician a a local electronics store, he immediately said "You can't go from a balanced to an unbalanced input and not have grounding noise. The reason: one channel shares the ground - allowing the AC clipping to occur.
Solution: The 8900 mic comes with a 1/4 inch adapter making the mic "balanced" if connected. Put the 1/4 inch input over the 1/8 inch input, PLUG THIS INTO A USB mixer and into the USB port- problem solved - no more buzzing AND BETTER RECORDING QUALITY!!!
iMac G5   Mac OS X (10.4.4)   intel Duo Core processor
iMac G5   Mac OS X (10.4.4)   intel Duo Core processor

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    http://img520.imageshack.us/img520/985/linksyswag54gx2pic1wb2.jpg
    http://img442.imageshack.us/img442/395/linksyswag54gx2pic2dy5.jpg
    http://img442.imageshack.us/img442/2549/linksyswag54gx2pic3ih4.jpg
    http://img442.imageshack.us/img442/7159/linksyswag54gx2pic4bp3.jpg
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    http://img248.imageshack.us/img248/4908/wrt110pic1tv3.jpg
    http://img248.imageshack.us/img248/6950/wrt110pic2vc5.jpg
    http://img248.imageshack.us/img248/5788/wrt110pic3fr1.jpg
    http://img248.imageshack.us/img248/4682/wrt110pic4vd6.jpg
    http://img248.imageshack.us/img248/3711/wrt110pic5sm4.jpg

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