Apple logo pops up and there a grey loading bar underneath it and then once the bar is loaded the computer turns off. Help please

My charger has a shortage in it and now everytime I start the computer the apple logo pops up and there a grey loading bar underneath it and then once the bar is loaded the computer turns off.

Time to visit an Apple repair station.
27" i7 iMac (Mid 2011) refurb, OS X Yo (10.10.1), Mavs, ML & SL, G4 450 MP w/10.5 & 9.2.2

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