Just a few days ago, again I happen to encounter a black-out CPU cause by a shorted reset button.If you troubleshoot the unit without disassembling or unplugging all front panel switches, chances are you will be mislead into believing that you have a defective motherboard.
Micro switches in CPU's accumulate dirt or stuck overtime(especially on cheaper CPU Casing) and will cause short circuit on front panel micro switches,it could be the power button or the reset button, and in this case its the reset button initiating a continuous reset of the motherboard as the CPU is turn on.
Next time when you encounter a black-out CPU, replace key components(mem,PS,processor) and still did not work, then this maybe your case.You can clean micro switches by dropping small amount of alcohol or spraying a contact cleaner on the top portion of a micro switch while repeatedly pushing the switch, if the latter still cause problem to the system you may opt to replace or just disable the particular switch.
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