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Released in 2015, the Thinkpad T450 is a lightweight, sturdy 14" business notebook that ships with a 5th generation Intel processor.

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Why is my laptop blinking power button

my lenovo T450 is blinking the power button as soon as i plugin the charger and won't power on, it does all this when the power button is not pressed please help....

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Have you tried taking the battery out and just use the charger?

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I tried a lot of things including that

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Forbes Kay apparently the T450 has some issues with the CMOS etc. For some a quick fix that seems to work is to reset the CMOS. Just disconnect it from the motherboard, wait a couple seconds, then plug it back in.  Check to see that if you remove your external battery and disconnect the internal battery that your laptop functions normally with the AC power supply adapter.  Download the hardware maintenance manual from here and check page 48 etc.

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This usually happens due to a low voltage on the CMOS battery with many of these laptops - some do not care as MUCH like my E6440 because the Flash ROM and CMOS RAM are power sipping, while others are so sensitive even being .1v below what the board likes may cause an issue and do not work because of an inefficient Flash ROM and CMOS RAM setup. It is a wildcard situation I tend to tread with caution around unless I know the machine can handle it first hand. Even then, a A00 board may have an issue that was fixed on the A01 board - either due to a revision to fix a hardware bug or a sensitivity decrease to get it to run with lower voltage batteries that are older. If I notice an issue, I’m just going to assume the board is touchy about the voltage. Batteries are cheaper then a motherboaard.

In this case, your best bet to cure this permanently is a new CMOS battery - but for testing the method @oldturkey03 mentioned is best. If you can check it with a multimeter and make sure it’s within 3-2.5V, then I would do it but if not I would probably just replace it just to be safe at that point - especially an older laptop like this. The Lenovo Part# appears to be 04W1642 or 02K7078. If you look at the Lenovo HMM on Page 34, it shows HOW to test the battery as well. Once you have the bottom off, replacement is easy enough you can do it in 20 minutes tops.

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FORBES KAY さん、ありがとうございました!
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