I have had a couple of lap tops exhibit the same sort of trouble caused by the batteries failing. Running from an external supply also fails because the battery floats and pulls the supply down to the point where nothing works and removing the battery also inhibits operation from an external supply.
Do what I did. Salvage the HDD and memory and ditch the rest. Then buy one of those cheap under $400 sale laptops. It will be cheaper in the long run.
Barry
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