I don’t know if pressing the reset button as number of times will fix the problem in your laptop but according to the [https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/t540p_w540_w541_hmm_en_sp40a26003_03.pdf|hardware maintenance manual] for your laptop, there is an ''emergency reset hole'' in the laptop in which a straightened paperclip needs to be inserted. (See p.26, Power system checkout #4)
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I don’t know if pressing the reset button a set number of times will fix the problem in your laptop but according to the [https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/t540p_w540_w541_hmm_en_sp40a26003_03.pdf|hardware maintenance manual] for your laptop, there is an ''emergency reset hole'' in the laptop in which a straightened paperclip needs to be inserted. (See p.26, Power system checkout #4)
There is no location shown for the reset hole in the hardware manual or the user manual but this [https://support.lenovo.com/us/en/solutions/pd100650|link] for a W550 shows where it may be located which may help.
According to the [https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/t540p_w540_w541_hmm_en_sp40a26003_03.pdf|hardware maintenence manual] for your laptop, there is an ''emergency reset hole'' in the laptop in which a straightened paperclip needs to be inserted. (See p.26, Power system checkout #4)
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I don’t know if pressing the reset button as number of times will fix the problem in your laptop but according to the [https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/t540p_w540_w541_hmm_en_sp40a26003_03.pdf|hardware maintenance manual] for your laptop, there is an ''emergency reset hole'' in the laptop in which a straightened paperclip needs to be inserted. (See p.26, Power system checkout #4)
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There is no location shown for the hole in the hardware manual or the user manual but this [https://support.lenovo.com/us/en/solutions/pd100650|link] for a W550 shows where it may be located which may help.
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There is no location shown for the reset hole in the hardware manual or the user manual but this [https://support.lenovo.com/us/en/solutions/pd100650|link] for a W550 shows where it may be located which may help.
Hi @Luigi Stefano Sona
According to the [https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/t540p_w540_w541_hmm_en_sp40a26003_03.pdf|hardware maintenence manual] for your laptop, there is an ''emergency reset hole'' in the laptop in which a straightened paperclip needs to be inserted. (See p.26, Power system checkout #4)
There is no location shown for the hole in the hardware manual or the user manual but this [https://support.lenovo.com/us/en/solutions/pd100650|link] for a W550 shows where it may be located which may help.