Could be memory effect. Have you tried letting the battery run out completely, and then recharging?
You need to set the power option in control panel not to turn off for low power, and just let the battery run out.
Or it could be a faulty battery. Have you tried another battery?
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if it is working fine with the adapter (charger ) on ..it means that it is just a matter of connections at the battery level ...or a matter of the driver that master the charging..Verify it in the device manager to see if you have any drivers in yellow with an ask sign on..in thi scase go to the support site and download all drivers and reintall them (in case you do not know which one ) or just the missing one ...
In case that no drivers appears t be missing ..check the contacts from the battery ( the ones on th emotherboard ...cause the battery appears to work in another device...)
Batteries last only 1 or 2 years in my experience, unless higher capacity batteries are used. If your laptop doesn't charge, it's likely a new battery is required to enable good charging of the battery. Try amazon.com or ebay.com for your make and model.
When batteries fail, they usually lose the cells inside them, which means that the cell is no longer able to function as a holding cell for power and therefore cannot do its job anymore, when a battery fails to hold and refuses charging it is bad and needs to be recycled. The flashing is telling you to purchase a new battery. The larger the number of cells in the battery, the longer and better it will perfrom,,RE: 6 cell, 9 cell, 12 cell.
Sometimes removing the cmos battery for 5 minutes isnt enough, with all the parts assembled in the original configuration, remove the running battery, the cmos battery and any external power supply. Let it sit for about a day. Let my know if the problem is unresolved after that.
The HDD light is not meant to be on solid, it comes on only when the hard drive is actually working. The situation you're describing is usually just a lockup in standby.
Although you're onthe right track with the battery, To reset the power, unplug the AC cord, remove the battery and then hold the power button for 30 seconds. Now put the battery back plug it in and turn it on. It may give you an error about not being able to resume, this is normal.
If this doesn't work get back to us with more info: does it beep when it turns on, how many times, longs/shorts.
Did you try plugging and external monitor into the laptop and rotating displays to see if your backlight is out?
If you have the AC adapter plugged into the portable, it will run on AC power while recharging the battery. Once you remove the AC adapter, it will go onto battery power.
If once you remove the AC adapter the computer dies, with a battery installed, then your battery is weak/dead or there is a connection problem, and the battery is not charging. But, I doubt this is the case, since it thinks the battery is at 80%. The system does not know if the battery is holding a charge.
You power settings are only timers, which reduce power consumption when idle.
Have you tried a KNOWN good battery? If your laptop does this with a battery that's known to be good, then the charging circuity is at fault. Also, try this: while the AC and battery is plugged in, unplug the battery. If nothing changes, then the laptop is the problem, if the status changes, then the problem MIGHT be the battery(ies).
Hope this helps, and please rate my advice.
Thank you, and good luck!!