Tom has a Lenovo Yoga 910, but he's getting a boot-up failure message. After trying a few times, it will boot up. Leo suspects that the hard drive is starting to fail. It's a typical problem with spinning drives. It could be that the head is sticking, a power supply problem, or that when the hard drive heats up, it starts to work as usual. Leo advises backing up your data, just in case. Easy fi: replace the hard drive. Head over to iFixit.com to see if they have instructions on how to upgrade your hard drive and go with an SSD if you can. It'll be faster and more reliable. If the problem remains, then there's other circuitry that's starting to fail.