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I have been given an old IBM ThinkPad T42 complete with mains charger, but I have an unusual problem with it. When I switch on the computer with the charger plugged into the mains, the screen stays blank, and the computer halts prior to BIOS start-up, although you can hear the internal fan operating. If I start the computer using only the laptop battery, then the computer boots up and operates correctly. Once booted up I can plug the mains charger in and all works well, even the battery charges. The operating system is Windows XP. The mains charger is not marked IBM but Delta electronics with an output of 19V 3.42A, centre pin is positive. Have you encountered this problem before? Thanks Ian

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I have a T42 here and the AC adapter (genuine IBM) is 16V 3.36A positive center pin

Posted on Jan 04, 2011

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