Spontaneous system alert sounds

Every few minutes my MB Ro "purrs" (alert sounds). No apps need to be open when this occurs. Disk utility report is NR. Repaired permissions anyway. FWIW, Drive Genius 2 is unable to verify or repair the disc.
Any idea why this is happening, and how to stop it?? Tech support had no idea.
Jeff

Well, it started recently but this MBP is almost 3 years old and I rarely use the widgets (and have not recently added to them).
Which one might you suspect? Other ideas?
Thanks!
Jeff

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