>I come late  to this discussion and am not sure of the beginning but 
>when power supplies start to fail sometimes they don't  have enough 
>oomph to power up what they previously could so after attempting to spin 
>things up, they (the motherboard) reverts to a showing single blinking 
>green or yellow light on the case front.   If the  computer is looping 
>around in this case, it may be that the bios  is set to restart upon 
>failure.

Good point. It could also be the mobo's power management and fixing that 
usually requires clearing its PRAM. It is hard to say even with careful 
first-hand observation, which is impossible via email.

So the best approach is to be systematic. Going out of order means extra 
work, extra expense, and makes it harder to collect information. Rushing 
to replace the power supply is only recommended if you are feeling very 
lucky.


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