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Ifthe laptop battery is more than 3 - 4 years old then the battery could be wornout. Rechargeable batteries have a finite number of charge and discharge cyclesand will lose their charge capacity over time, i.e. won't charge to 100% andgradually the charge reduces until the battery won't charge up atall.
ORThe battery shows a 100% charge but when the adapter is disconnected thebattery drops off to zero capacity in a very short time.
Ifthe battery drops to an unacceptable charge level then the battery needs to bereplaced.
The blinking light usually means the battery is dead and can't power on the laptop. If the charger is bad and won't charge the battery you will have that type of error. Get a multitester and check the voltage coming from the ac adapter. Put the meter on voltage, now put the red lead on the center pin and the black lead to the outside metal contact. You should get a reading of 18 to about 26 volts. My guess is the adapter has a short and can't power the unit. You should be able to get a replacement adapter from Ebay.com
I hope my solution works, If so please rate my solution.
1) Remove battery and power cord 2) press power button several times 3) Whack laptop on the bottom center 2 or 3 good times with the palm of your hand 4) Replace battery and plug 5) Power it up (may have to hold the power button several seconds)