My old Pentium IV had started having problems powering on. Pressing the 
power button caused a mere flash on the "HDD" and "On" LEDs. Workaround: 
unplugging, waiting a few seconds, plugging back, pressing On again. 
Sometimes twice, sometimes three times, sometimes took up to ten tries 
until it finally decided to start. Then one day I got tired of trying 
and it refused to start.

Solution was a power supply replacement.

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