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I have a MacBook Pro 2012, i7, 8 GB RAM, 256 GB SSD For some reason I can’t use my laptop properly. It takes about 10 minutes to boot and sometimes it comes up with the cirlce with the slash and then turns of. It use to take only 30 seconds to boot. When I have the chance to log in to my laptop, it lags out and every click I do to do somethings lags the computer out for no reason? Does anyone have a solution for this?

Lets start by reviewing your battery. Download this app: CoconutBattery take a screen shot of the main window and past it here for us to see Adding images to an existing question