Different chips start cutting out at different voltages. Strange things occur when things we take for granted start to change mildly. Intermittent failure is so typical of PSU problems and a few other sources. Is it the PSU? It could also be a number of other related problems. But this simple lesson about solving hardware intermittents from one who has been solving intermittents long before there were PCs. Take the power supply DC voltage measurements.
Not only must numbers be in spec, but some at the lower end of spec require further evaluation. Do not wildly replace a PSU or anything else until first establishing basic parameters. And do not use the motherboard based voltage monitor for a voltage measurement. That monitor is only relevant to detect changes - not reliable enough for actual measurements.
XP keeps system logs. What do they say?
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