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If the laptop battery is more than 3 - 4 years old then the battery could be worn out. Rechargeable batteries have a finite number of charge and discharge cycles and will lose their charge capacity over time, i.e. won't charge to 100% and gradually the charge reduces until the battery won't charge up at all. OR The battery shows a 100% charge but when the adapter is disconnected the battery drops off to zero capacity in a very short time. If the battery drops to an unacceptable charge level then the battery needs to be replaced.
Try to turn off your system. Then remove the cables and battery on the laptop. Then press and hold the power button for 8 secs. Then, reinsert the cables and battery on the laptop. Then, press the power button to turn on the laptop. If the HDD light flickers continuously, then the problem is on the Hard Drive. One way of resolving it is to Re-Seat the Hard Drive. If you know how to tear down the system, here's how. Turn off the laptop, remove the cables and battery at the back. Remove the screws located at the corners of it. Then remove and reinsert back the Hard Drive. If it still fails, contact ACER to immediately replace the Hard Drive. If you don't know how to tear down the laptop, then call ACER also for repair....
try to open ur laptop cover .
on the mainboard there is usually a jumper located near the cmos battery. try to change its position for 3 seconds and return it back to its normal position.
this way u will clear the board memory .
start ur computer and load default settings.
hope this will help.