Computer won't turn on or stay on unless it's plugged in

Ok, so i left my computer in sleep mode on my desk while I was gone today. When I came back, my computer was dead. I was confused because I didn't leave it on so there was no reason it should have died. Now, it will not turn on unless it is plugged in, and if I unplug it, it will turn off. It doesn't turn all the way, because it will bring back all my data when I plug it back in, but the screen turns grey and it takes a few seconds to do so. Also, just for more information, when my computer is in sleep mode, the white light on the front stops blinking when I unplug the computer.
Any help? I'm so confused and slightly frustrated.

Welcome to Apple Discussions!
It sounds like either your battery is completely depleted or not being recognized or possibly on the fritz. Even in sleep mode, the battery will slowly be depleted, and if it was low to begin with, it could now be too depleted to run the computer.
When you plug in your power adaptor, is the LED orange or green? If orange, then it is charging the battery, and you need to leave the Mac on the adaptor until the battery is fully charged up.
If the light on the power adaptor is green, then the battery is not being charged. If this is the case, try resetting the SMC:
http://support.apple.com/kb/HT1411?viewlocale=en_US
If still no joy, go to >About this Mac>More Info>Hardware>Power and see what it says about the health of your battery.
Good luck!

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Computer won't turn on or stay on unless it's plugged in

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