Okay, so, I have a 13" 2011 macbook that I got in 2011. About a year and half ago it turned off suddenly and wouldn't reboot, I tried restarting the SMC and all the other stuff they recommend when this happens but nothing worked. Then about a year later I tried plugging it in and it turned on as soon as I plugged in the charger. The battery was at 0% and the time and date were reset to the year 2000, other than that everything was as i had left it a year previously. It worked fine for a couple weeks then turned off suddenly and wouldn't turn back on. I just got it to turn back on, I pressed and held the power button for a few seconds then when that didn't work, I plugged in the charger and it turned on by itself. Same deal, 0% battery, reset time, everything else fine. I know I should really just get a new computer, but I'm pretty poor right now and was hoping someone could at least tell me why this is happening?