Originally posted by Jog On
Surge protectors can cause more problems than what they are worth so best remove them for trouble shooting purposes.
If you have a clean power supply, use an extension cable or move one PC to a new power outlet.
Try running a PC from a proper UPS.
Start cross swapping PC parts one at a time and back again with a known working PC.
Problems are most likely to be with RAM or system boards and then PSUs.
Many years ago I worked for a third party maintenance company, it was not unusual to get batches of new PC failing on the same faulty component at the same time but in various parts of the country. Eg: If a system board failed on a new model after six weeks of use you could safely bet a dozen others would do so in a matter of days.
Mains monitoring is a whole branch of science on it's own and you need special equipment to monitor the sin waves properly. (frequency, strength, noise, synchronization and even the curvature of the sin wave). If you have access to an oscilloscope (buy one on ebay?) it will help.
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