Acting like a diva - won't power for long periods

Swapped the cable with working one, removed all USB attachments, done the reset, yet it only power up every blue moon. Any ideas?

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What cable did you swap? What kind of reset? What operating system? How far does it get? Do you get a progress bar. You have come to a fine doctor and not told him any symptoms with the exception of "sick"'. Could be a simple virus or cancer, I have no idea from the little you have told me. Some Doc you are ;-)

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