Sounds like you are having issues with the motherboard since we are talking about a laptop here. However, there is a way on how we can isolate that the motherboard is the main problem. Remove the memory by clicking this ---> http://support.dell.com/support/edocs/systems/ins6400/en/om/parts.htm#wp1103163
If in case the system would still act the same, call up Dell with the service tag or express service code to have the motherboard replaced.
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Please try to reseat you memory RAM and try to turn ON again. If you want to retrieve Information on your HDD, you can take out your HDD from your laptop and use USB External HDD case. Please refer to link below : http://shop.ebay.com/i.html?_from=R40&_trksid=p5197.m570.l1313&_nkw=HDD+case&_sacat=See-All-Categories
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Try a hard reset. Sometimes it works and is always the first step to take. Remove the battery and the ac adapter plug from the laptop. Press and hold the power button for forty seconds. Install the battery and ac adapter .Now press the power button to attempt a boot into the OS.
If that doesn't work then remove the hard disk to see if it gets past the splash screen and the BIOS whines that it can't find a boo-table OS. That would indicate a hard disk failure. Also try to remove the memory module(s) from the DIMM slots and then reinstalling them. That reset the modules and cleans some oxidation off the module pins (if there is any)
The problem you're having there is a motherboard issue, The computers power button is amber and it flashes that means the power inside the computer is not being distributed properly. You said that the battery is 100% charged but when you unplug the AC the computer will have no power, that means the motherboard is failing, its not identifying the battery as a source of power anymore,
You can try to use another ac adapter and check if the computer will boot up, or try to unplug and plug the memory and hard drive see if any changes will happen, If the computer turns on with another ac adapter and boots up to windows properly then try to update the bios. If the ac did not also the memory and hard drive,. You'll really need to get a new motherboard.