I'm working on a Lenovo ThinkPad X260. It doesn't complete POST. It gets stuck at the Lenovo logo on screen and “To interrupt normal startup, press Enter”. Turns out the SSD is defective (I will talk about that shortly). If I remove the SSD, it POSTs then tries to boot from a network. There's no network so that's not going to happen. I put in a hard drive from another machine and the Lenovo booted to it. So there's something wrong with the SSD. My on-line search found others with the same problem with Lenovo machines and this Intel SSD Pro 5400s. It was manufactured Feb 2017. I don't know how to update the firmware if the machine won't even boot with the drive connected. Lenovo tech support is useless. The machine is under warranty so they're going to send a tech to replace the SSD. I sure would like to see if I can update the SSD so data won't be lost. With the SSD connected to another machine via SATA/USB adapter, it's not seen in This PC or in Disk Management. One more thing about this computer. In addition to the usual removal system battery, it also has a removable internal system battery. It connects to the system board via a connector (it's not soldered in place). It's also physically removable so you can get a replacement part. See here https://www.one-cable.com/original-...50ZlntIoqGnvXcMICv-U83G7auankGZhoCVd0QAvD_BwE First I've seen an internal battery in addition to an external battery.