device: lenovo thinkpad x270 after updating bios, my thinkpad is stuck
What if you remove your HDD/SSD connection cable? Can the laptop get past BIOS screen and get into PXE Boot screen?
If yes, then HDD RIP. As far as I know, most of X240-270 are still using 2.5 SATA HDD or SSD. If you're still using old school HDD, please invest a SSD.
Try going into the BIOS and resetting it to default settings and then putting a pin or something in the small hole in the centre if the backplate
Your motherboard is stuffed. That's my opinion. Try removing the battery, holding down the power button for 30 seconds then put the battery in and try to boot it. It might just need electrical dissipation
I see you just updated the BIOS and this is happening. Boot Windows from a USB and reflash the BIOS. That's the only option I can think of. Boot off of something and reflash the BIOS. It is most likely a logical problem. You might have damaged the MBR in the process of flashing the new BIOS so the computer has no way of identifying how to boot or what to do/what actions to perform. If that doesn't work try reformatting the hard drive to GPT and then back to MBR to resolve the logical error. Also try reinstalling Windows from a CD or DVD. You could also burn the ISO installer to a USB. Sounds more like a logical issue than a physical one
if you have confidence in your self to open it. try disconnecting internal and external battery. after that disconnect also the cmos battery and press power button for at least 30 seconds. after that plug the cmost battery and then the charger and press power button. if this does not also help disconnect the cmos battery, and leave it overnight. plug the cmos battery and charger and press power button
you might also want to put the cover, lenovo has this "new" technology if the bottom cover is not detected then the laptop won't boot up
Try booting off a Linux USB key - if it boots off of that , you just need to fix the drive MBR etc -
The worst case scenario is that your HDD or SSD is faulty but it could also just need reformatting to MBR or GPT depending on what OS you use (really only MBR unless you use Windows 11 but given it is an x270 I can guarantee it doesn't meet the system requirements for 11 and should be formatted to MBR) and whether secure boot or not due to logical corruption caused by the BIOS update (AOMEI make great tools for things like this.) Replacing the HDD or SSD with a new one would fix this immediately though obviously. Then when the drive works fine all you have to do is change the boot order to boot from a USB you've inserted (in the first top boot option 1) followed by the HDD or SSD and make the USB a Windows USB installer you've previously created (you can create one through flashing the ISO OS image onto the USB via Rufus) reinstall the OS that way and your laptop should be fine