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You may have a burnt board or the input pin is bad, try wiggling the pin while it is plugged in to see if you can at least get the fans to start you obviously have a short of power in the power button area. You may want to try replacing the power button board for your model this may offer you a solution. If you take it in they can test it with a meter to make sure that this is the problem before a board issue is determined. It is difficult to diagnose this kind of things without the machine in front of me. My advice is to take it in and have the power investigated. Just because the lighting on the battery is going and showing signs of life does not mean the power button is not bad or not getting the proper power to start the computer. It seems to me that the power button board is bad. Or the input cord pin may be shorted out and only supplying power to the mains but not the power button circuitry. Just a good guess!......John
This indicates an internal failure in the battery. While the battery may hold a charge and function, the system has determined an internal failure (Cell with low or no voltage etc) and the only way to resolve the failure is to replace the battery
Finally I got it working again, after a lot of try's (just put the plug in for a few hours) the led was red again for a brief moment, then it starting to flash orange again.
I looked it up on a lot of forums, the problem is that the (old) bios doesn't charge the batery anymore when it is deeply discharged.
So I put the plug in and out for about 10-15 times , and the brief moment it is not flashing it's still charging. Until it is not deeply discharged anymore and then it is charging the batery like it did before.
But I still don't understand why it is not working without the batery inserted ??
You can't get the modern batteries to come back to life. Time to get a new one. A suggestion: When using a laptop battery, run it on battery and discharge it until it shows about 2 to 3% charge left at least once a month. Do not keep charging it without letting it run down periodically. Most important--do not run always plugged in to line current.