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The variation you saw for the *5V is rather bad. A noisy 5V can cause havoc.

I am going to buttume that the +5V is stable at these shops, which leads to an unusual power problem where you normally run the computer. To sort-of verify that, move the computer to a different site (down the block, or better a different part of town) and try it there. So, after a test or two like that, with the result of "OK there" will certainly point a finger at the power line where you normally run the computer. That being the case, my question would be "how many other devices are on that same line that has switching supplies"? All CFLs are in that category, and if there are a lot of them on that power line, you have serious power line problems. A number of modern "consumer electronic" items use switchers: DVD players, home "entertainment" systems, and many of the related components. Many of these damn things are "ON" all the time - just like your TV set and VCR. So, the only way to guarantee that a given device does not add its part to line hash, is to *unplug* it.

Say if there are only a few on a given power line, they might add, BUT more than some undefined given number, the problem grows exponentially and can result (say if all CFLs on the line) in oscillation (lights flash or do wierd brillance "tricks"). With a combination of switching devices, the results are even less predictable.

How to remove problem programs
Hi, I've been having a problem with my PC for about a year now. It will...

What i have described is not common, but has happened in some industrial places - so it *might* be possible "at home".

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