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 1 min 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 ?

Thank you.