I have a Macbook Pro that I bought in 2011. I'm currently running OS X Mavericks 10.9.4.
Recently I've been having a very bizarre problem when I start up my computer. If the computer is shut off and unplugged it will not turn unless I plug in the charger. Once it has started up however, I can freely remove the charger and the computer still works. I appear to still get a regular charge and am able to use my computer until the battery is depleted. This also happens if my computer goes to sleep for more than a few seconds. I can't wake it up again until the charger is plugged in, but after that I am able to unplug it. Before this problem started happening, if my computer was in sleep mode I could press the space bar or tap the mouse to get it to wake up, but now I can only press the power button (only when it's plugged in) and when I do, it will bring me to a loading screen (which looks like this http://support.apple.com/kb/HT1757) before I am able to sign in. I've also noticed that when it is unplugged it will say 99% or 98% battery even if I've been using it for a few hours. Once I plug the charger back in, it will display the actual battery percentage.
What I've tried so far: Initially I thought that maybe the battery was dying. I looked at the status of my battery and the number of cycles. Under the health information on my battery it says that the cycle count is 281 and the condition is listed as normal. I've attached the rest of the battery information in case it helps in anyway.http://imgur.com/zqd3vdH
After this I tried resetting the SMC as I have read that this can sometimes fix battery and power issues. The first time I did it the fans on my computer went crazy but I was able to turn the computer on without the charger. I shut down the computer and tried resetting the SMC again. The fans shut off but my problem came back.
Next, I figured that if I reformatted the computer this might fix my problem. It didn't. I completely wiped the hard drive and reinstalled OS X Maverick but I'm still having this issue.
I tried to reset the PRAM but no luck. I tried one final time to reset the SMC but that failed to work, again.
I have just recently bought a desktop PC but I need this laptop to take with me to classes. Most of my classes have one or two outlets that are always taken up by other people, so it would be difficult for me to keep using the computer the way it is.