“Not all broken capacitors will bulge, swell and burst, however. They can fail and you would never know by looking at them. If there are no physical signs, an oscilloscope–a device that displays how a voltage or current signal varies over time–may be used to examine the voltage on the capacitors.
Experts say you should run a system test on the memory and check to see whether the main processor shows abnormally high temperatures when you have little or no applications running.”
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Source: CNet News.com
According to this article on CNET, not only are we in for another run of bad capacitors on mobos and graphics cards, some of them won’t be easy to spot. Not all bad caps rust, ooze or buldge, some sit there looking perfectly healthy while secretly sabotaging your enjoyment. They offer a few hints to spot them, without bringing out the ocilliscope.