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Recover apparently dead USB ports Desktop Macs
The front USB port of my dual 2.0 gHz G5 desktop seemed to go dead. Flash drives would blink once and not mount. System profiler would show nothing in the port. A discussion on an Apple hardware forum had the solution: shut down the desktop and unplug the power cord for 30 minutes. Restart with nothing connected, then connect each USB component. I tried it and I found all the ports working again!

[kirkmc adds: You never know... I guess this has something to do with letting the capacitors somewhere inside the Mac lose their power...]
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A possible fix for a broken G5 temperature sensor Desktop Macs
While much has been written about the placement of the drive bay temperature sensor on the first generation G5 Power Mac, I was unable to find information about what to do in case of sensor failure. In my case, the drive bay sensor reported temperatures oscillating between 77 degrees and 255 degrees in less than one second!

After trying a PRAM reset, a PMU reset (my model does not have a SMU), resetting NVRAM in Open Firmware, etc. to no effect, I finally disconnected the drive bay sensor from the motherboard. I expected all nine fans to rev up to full speed, but instead my fan noise problems disappeared! Furthermore, the drive bay fan, as well as the rest of the G5's fans, still spins up in response to the remaining, functioning sensors.

As usual, all disclaimers apply -- doing this can ruin your machine, and will certainly void your warranty, and should only be done as a last resort.
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10.4: Resolve Bluetooth range problem on Mac Pros Desktop Macs
My new Mac Pro had a problem with Bluetooth: the reception between the Mac Pro and my wireless Mighty Mouse was terrible. The mouse worked fine at about two feet from the Mac Pro, but at three feet, it skipped and stuttered.

I contacted AppleCare, and they were going to send a technician to change the Bluetooth module. It turns out, in the meantime, that I found this thread on Apple's discussion boards talking about this problem, and offering a solution.

In short, there are a few wires coming from the motherboard to the Bluetooth and AirPort modules, and two of them are mislabeled. I've written up the problem and solution in this article I hope this helps others who have problems with the Mac Pro and Bluetooth, and I hope that Apple notices what the real cause of this problem is.
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Fix Boot Camp drive speed in XP on a Mac Pro Desktop Macs
Running Boot Camp on a Mac Pro? If so, then you've probably noticed the sluggish drive performance when booted into Windows XP.

Terrabit came up with a solution that uses something called "slipstreaming" that creates a modified Windows XP install CD-ROM with the needed drivers to speed Mac Pro disk I/O from under 4 MB/s to over 60 MB/s. Fortunately, only Mac Pro models are affected by this issue.

I have a simplified version of this technique (with lots of screen shots) on my web site if you need additional details.
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Fan noise and/or chirping in earlier G5 Duals Desktop Macs
I noticed when browsing some folks' hints for reducing fan noise in the Power Mac G5, that many folks seemed alarmed that their CPU temps would go up unless they had the fans churning by manipulating Energy Saver prefs. CHUD Tools (linked on this page) allows you to turn off processor "napping," which eliminates the relay noise caused by the disconnection of processors in preparation for nap mode.

Don't worry about the heat from specific areas. Just because the temps jump from a very low 9 or 10 degrees Celsius to upwards of 80 degrees does not mean that you are sacrificing your processor or its lifespan. Sure, you may notice a slightly reduced lifespan in processors that worked harder or were cooled more sparingly, but by the time they wore out, the machine would be obsolete and gathering dust somewhere.

The zoned cooling of the Power Mac G5 is brilliant. However, it leads people to believe that a particular zone is too hot. The heat generated by processors that are properly heatsinked and ventilated is normal and within the range the processors are designed to run in.

For me, I had to disable the manual setting of "Highest" in Processor Performance in Energy Saver and put it to "Automatic" to achieve some quiet. For some reason, the fans are not intelligently cooling in my machine when this setting is engaged. They vary in speed, but still are noisy even when nothing is on and the unit is in Sleep. Automatic seems to bring the fans down and kicks them in as needed. So if you think your fans are a bit too noisy, try Automatic mode.
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