Canon printer MG5250 not start

Hi ..

I have canon mp5250 printer it won't start when I push power button , but some times its start for less than 1min maybe then power gone again and dead !

at the beginning it was have error B200 , I just open the cover and moved the print head to the middle and re turn it on then I closer the cover when the head was at the left , after that I faced that problem of power
any ideas?
Thanks.
 
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