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The technician at the Apple Store told me that all of the power supplies being shipped now are of the latest configuration, and the success rate of fan noise abatement has been excellent.' Before the replacement, the noise sounded like a bad ballast in a fluorescent light fixture now it's just a faint whirring sound, certainly acceptable. One reader writes 'Apple just replaced my power supply (1.6 GHz single processor) and the loud fan noises are gone. Success with power supply replacement We are beginning to receive some reports of success eliminating excessive fan noise with replacement power supplies shipped by Apple. It appears that this issue is manifesting on some Power Mac G5s, which use SATA drives. SATA noise Some newer Hitachi SATA hard drives are prone to move their heads around once every 10 minutes, which causes a minimal noise similar to a CD-ROM drive seeking. In other cases (similar to the G5), setting the Processor Performance setting in Energy Saver preferences to Automatic or Reduced seems to eliminate the noise for some PowerBooks. It appears that in one scenario, the 'chirping' noise (sometimes more akin to a click) occurs whenever the audio is being engaged on some PowerBooks. In house, we've noticed a similar issue with our PowerBook G4 12'.

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Whenever I select a QuickTime movie in the finder ' I hear noises whenever: Mail accesses the network. 'I like to point out that some of these noises are also occurring on my PowerBook G4 15'.

Other Macs affected? Our discussion of the various Power Mac G5 noise issues has prompted users to notice odd audible blips on other Macs.

#Target mac vga adapter mac os

UPDATE: This behavior is due to the fact that the fan regulating mechanism is in Mac OS X, and not innate to the G5. Namely, when using FireWire target disk mode (G5 as the FireWire volume). We've since identified a few additional scenarios where this problem is happening.

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More on full fan speed: FireWire target disk mode We previously noted an issue where putting the G5 to sleep results in the fans revving up to full speed. The product's description claims 'The cooling performance even in the ultra-quiet mode is better than most of the original coolers supplied with the graphics-card.' We found a German site that offers a replacement fan for the ATI RADEON 9800. Making it worse, the Apple DVI-VGA adapter seems to occasionally start resonating with the vibrations of the fan, making an even more annoying, harsher buzzing sound at the same pitch unless I jiggle it or thwack the computer to shift the weight of the VGA cable.' 'This noise seems to be at least as loud as the entire rest of the system combined and is at a higher, far more annoying pitch-it is easily audible two rooms away. I have heard many others complaining about the 9800's fan, to the point some have spent a fair sum of money on quieter replacement fans, leading me to believe that my guess is correct. It's surprisingly hard to pinpoint, but I'm fairly certain it is coming from my RADEON 9800 OEM card's fan (custom ordered at the Apple Store, that is). 'There is a fan somewhere in my machine that makes a maddeningly loud and annoyingly pitched whine. Marc Marshall describes the noise, and when it seems to occur: RADEON 9800 fan noise In addition to the 'chirp,' 'metallic screech,' 'overall hum,' and 'constant tick,' issues noted last week, we are beginning to receive reports of an extremely distracting noise generated by the optional ATI RADEON 9800 graphics card.