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either a bad battery, or charge port. even if the battery was fully charged it will still keep the light on, try this. plug it in, and power it on, then remove the battery completly, the computer should stay on, as its running off the plug power cord. if this port is a bad one the pc will shut off immeadatly. and if it stays running then it will be the battery.
If you plug in your adapter, is the charge light on? If not you need a new AC adapter (the part that plugs into the wall all the way to the plug that goes into your laptop jack) or the jack is bad - they wear out mechanically or even break the solder joints.
If not then the machine is trying to start from battery, the battery is too weak and it shuts off and gives a red. If the light does stay on even if you wiggle the plug into the machine then you may have a bad charging circuit on the motherboard inside. In that case you may need to find a reputable shop (NOT Geek Squad, they will only want to sell you a new machine).
Check your mains adapter plug that connects into the laptop power socket with a multi-meter, the voltage should be slightly higher than the voltage that is printed on the label on the bottom of the adapter. If the voltage is zero or way below the voltage that is printed on the label then the power adapter is faulty and needs to be replaced. If the adapter is OK then connect it to the laptop and power it up, then look at the power/battery charging LED light and wriggle the power plug in the laptop's power socket. If the power/battery LED light flashes and in a certain position this LED light stays firm, then the power socket is either faulty or it has a dry solder joint where it is connected to the motherboard. This can be repaired but it requires the laptop to be completely dismantled to get at this power socket and repair. I suggest you get a quote first.
Sometimes the voltage regulator in the battery hit a point where they fall below a certain efficiancy % they have to operate at. Once they fall below that % you must replace them, even if the battery is 100% charged. Its usually a good idea to pick up a new charger as well with a new battery since they are known to die as well. Make sure you check the socket in the back where your charger plugs into the laptop to make sure its not loose or cracked. Sometimes the plug will crack off the motherboard and not make good enough contact.. But regardless of that it should atleast turn on if the battery was charged and good. Best bet, new battery. Every 2 years you should get a new one.
It sounds like the laptop was in a screen off state (happens when it is left on but not used for a while). When you pushed the power button it went to shutdown, and notified you that someone (you) is still logged on. Any unsaved work could be lost, hence the warning.
Five minutes later when you went to switch it back on, the laptop coincidently must be low on battery, to the point where it will not stay on, and exhibits the problem you are experiencing now. Try plugging in to power and make sure that the battery is charging, and try again.