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Flashing on and off at startup

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Hey all!
I plugged my computer in and wiped the drive before selling it, turned it off and unplugged it.
The buyer took it home turned it on and would boot up and down over and over
Whats going on?
It begins to boot up and shuts down then repeats
Thank you :)
(Cant figure out how to attach a video)
 
I would be reseating every connection,on the Mobo, including Ram, and remove the cpu, and check every pin with a bright light and Magnifying glass.Motherboards can go at any time, but you need to check every alternative first.
 
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