MBP makes wierd sound on top left keyboard when waking up from sleep

Hello fellow Mac fans
I just received a new MBP from my other one because the old one had that sleep black screen issue. The new one is less than a day old. When I open the lid to wake it up, it seems to make a weird sound on the top right near the del. key. It last for about 1 sec and dissapears. Im not sure if its the hard drive or a fan? Could it be the harddrive head moving? Is it suppose to when it warms up from sleep? My older one, which was only 1.5 weeks old since I returned it, never made a sound like that. I hope I dont have another issue with my new MBP Thanks again
Mark

So it's not an alarm sound? When I had my MBP replaced (I had the same black screen issue and I warn you it may come back... it seems like it may be a third party software issue, widgets or a screensaver) I woke it up one day and an actual alarm started going off and I had to do a hard restart to make it stop.
As for different sounds between MBPs, I've tried four different ones and I don't think any two sounded the same, from the optical drive to the fans or hard drive (and the hard drive is in the lower left corner, by the way). It could be the optical drive or the fans spinning up.

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