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Have someone help you as it's hard to reach around a large tv sometimes.
Unplug the tv. Hold down the volume down and Handel down button. Now, have the person plug in the power for you. Continue holding the buttons and you'll see the screen flash or turn on.
If that doesn't work, try holding just the power button and plugging it in. If that doesn't work, try all 3 buttons.
You'll see the red light flash green or stay green and turn on. You might hear the power supply click on or hear the buzz of the inverter.
If it doesn't work after a few tries, the backlight bulb might be bad. It's probably been on too many hours, and so, the backlight will burn out. It's not worth fixing (if you can find one) so just buy s new one. That, or the inverter is shot.
Newer LEDs do not have inverters so it'll never burn out totally. However, it is possible for a single bulb to burn out, in which you'll see a dark sport or shadow effect.
try turning your system on without the battery if it powers without the battery then there is something wrong with your battery and may need replacing,
Also try doing a power drain on the system remove the battery while shut down make sure the adaptor is not connected to the machine press the power botton down for 10 seconds to drain whatever power the Mainboard has then try putting the battery on the system and conenct the adaptor and power it up if the system powers up that will be a good sign but still you may ned to call you computer manufacturer to check for any info about the battery it is possible you may need to replace it ^_^
But before you buy a new battery, You need to again repair the power plug where your adaptor's plug is inserted so that it will not create any problem later. There might be loose connection or sort wiring.. Good luck..
Dell has a chip internal to the battery programed to shut down after a certain number of charge cycles. This means every time you plug the laptop in with the battery installed. When it reaches this determined number the battery effectively shuts down, even though technically it's still good. There have been loads of complaints on the net toward Dell over this issue. I have myself experience this. Battery good one day, powered down, went home, powered up... only to receive the deadly flashing light. Only cure is to replace battery. Several hacks trying to get around this but they're all horrible. Bad Dell - bad, bad Dell!
Yes your laptop should power on with just AC power. The issue could be a loose connection for the AC power which caused the battery to stop being able to charge also. Unfortunately only solution for that if it is incase the problem is to open the laptop and have the power connector re soldered onto the board.
Try taking the battery out and running the laptop with just the AC adapter.
Also you should use a multimeter to test your AC adapter for voltage. If there is voltage from your AC adapter and the unit will not turn on with the battery removed then you have a faulty motherboard or another component in the laptop.
If it works without the battery all you need to get is a new battery or live with it without battery.
The battery indicator flashing when plugged in to electrical plug means your battery is completely dead and won't charge. You're computer should run with just the power cord. Your power cord most likely needs replacement.
If you know anyone with the same model of laptop ask if you can borrow their power cord and/or battery to test it out. It is rare for the problem to be the motherboard, though it does happen.
It may just be the power cord at fault as the computer should run without the battery, so you should replace the power cord, as it is probably the reason the battery is completely dead.
If the battery is at least a year old I would replace it since they generally don't last too much longer than a year.