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My Performa 6400/180 has white noise coming from the internal and external speakers. &nbsp;The noise also comes out of the front headphone jack. &nbsp;I can turn off the noise by turning the internal speaker down and by putting a speaker wire into the back speaker out port (but only without speakers attached to the wire). &nbsp;Turning the system volume down does not get rid of the noise. &nbsp;The noise turns into a slightly higher pitch when I click on a menu button. &nbsp;This noise used to occur only after long cumputer usage-6 hrs, but now it's there right after bootup. &nbsp;PLEASE HELP!
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My Performa 6400/180 has white noise coming from the internal and external speakers.  The noise also comes out of the front headphone jack.  I can turn off the noise by turning the internal speaker down and by putting a speaker wire into the back speaker out port (but only without speakers attached to the wire).  Turning the system volume down does not get rid of the noise.  The noise turns into a slightly higher pitch when I click on a menu button.  This noise used to occur only after long cumputer usage-6 hrs, but now it's there right after bootup.  PLEASE HELP!

white noise on performa 6400/180 speakers

Apple's early computers ran on a variety of operating systems, including a Pascal version and one based on CP/M, before releasing its ProDOS with the advent of its 16-bit computer. With the release of the Lisa, which had its own OS, Apple and computing entered the graphical age; it was followed by the Macintosh, which offered a series of "System" operating systems. Other Mac operating systems included PowerPC until Apple acquired NeXT and folded it into the Mac OS. Current operating systems for Apple devices are Mac OS-X and iOS.