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I came across a similar issue before. I found out it is believed to be a glitch with an overcharged capacitor inside the unit on the T series laptop. To remedy the problem, first remove any batteries (i.e., the internal battery and the Ultrabay battery, if installed) from the unit. Next, you need to drain any remaining charge from the capacitor: With the batteries removed, hold the power button down for at least 90 seconds. The overcharge should completely drain, and you can then reconnect the batteries or AC power and turn on the unit. I have not actually tried this myself. Hopefully your results will be positive.
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