Question about IBM ThinkPad R40 2722 Notebook

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Thinkpad r40 wont reboot

After pressing the power button, computer doesn't power up. The battery light is lit and there's another symbol lit as well. i'm not sure what that symbol is for though. It's left of the battery light symbol. It's looks like a circle with a z in it.

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Batteries can develop a dead short and cause a no start. Try starting without the battery. Other things you can try is checking the power supply with an ohm meter,or plug it in and stick it in your mouth, but me personally, I'd use the ohm meter. Also check the memory, a faulty memory chip can cause this. If none of these work, them I'm afraid the problem may be with the power management chip on the motherboard. If the pm chip is malfunctioning, then motherboard replacement is your only option.

Posted on Jun 28, 2008

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Posted on Jan 02, 2017

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This could be a problem with the battery, try removing the battery and starting on the adapter only. If this doesn't work, then I'm afraid it is going to be a motherboard problem, most likely with the power management system, this is the most common area with this type of problem. You can take it in for diagnostics, but I'm afraid you're going to end up having to replace the motherboard in order to fix the problem.

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1 Answer

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Batteries can develop a dead short and cause a no start. Try starting without the battery. Other things you can try is checking the power supply with an ohm meter,or plug it in and stick it in your mouth, but me personally, I'd use the ohm meter. Also check the memory, a faulty memory chip can cause this. If none of these work, them I'm afraid the problem may be with the power management chip on the motherboard. If the pm chip is malfunctioning, then motherboard replacement is your only option.

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