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Obviously there are no error messages, so it isn't a simple failure.
1. Dead or damaged battery - look for laptop battery error light or replace battery (borrow a working battery to test)
2. Dead or damaged Power Supply- look for power-on light to confirm operation. Replace PS if dead. (Borrow?)
3. System board failure. No lights/errors messages etc. Place warranty claim.
The simplest check you can do on a laptop that wont turn on is to remove the battery and try again with just the power lead.
If the laptop will turn on OK then you have a faulty battery that is causing the failure. This is not a test that will fix all dead laptops but it is a great starting point if this works then all you need do is order a new battery these are about £20-£50 depending upon make and model.
It could be:
1. Dead battery due to faulty Charger. Check the voltage of the charger output. Replace if dead.
2. Dead battery NOT because of charger. You can check it by plugging into the wall socket. Replace if found dead.
3. Faulty power jack on the laptop. Replace it if battery is fine.
4. Faulty power on switch. Needs a replacement.
5. Fault ahead of the switch, then need a professional job.
Try removing the battery and plug in the power adapter and then power on your laptop. If this doesn't work, put the battery back in and plug in the power adapter and try turning it on. If that doesn't work then take the power cable out and try with only the battery. Try in this order and see if it comes back up, if not, you may have some dead hardware.
Starting with the easy stuff: Try plugging in the power cord, but not the battery. If that works, your battery is either dead, or the circuit for it is shorted out. Are there any signs of life? When you press the power button, do you hear any fans? do see any lights? Does the screen flicker? Your RAM may be dead if it does.
Hi This sounds like a tricky one. If you plug everything in and turn it on at the mains do any lights on the laptop come on? Does it do anything at all when you turn it on? If you get back to me I can proceed to help you further. Good luck! Phil
to answer your question "will laptop work if battery is dead, even when its plugged in to an outlet"...the answer is yes. you can even remove your battery and run it off outlet power. As far as your dead laptop...not enough info to diagnose.