My client purchased a Lenovo T540p with Windows 7 and proceeded to migrate all his user files and a bunch of viruses to the new computer. As the rescuer, I explained that there were plenty of good reasons to put Windows 8.1 on a new computer. I installed a full license version of Windows 8.1 Pro to get a truly fresh start, then installed the Lenovo Solutions program and used it to identify, download and install all the drivers. The computer is working perfectly, except when it is in sleep mode, it will not resume. In the power settings, I set sleep to Never, so sleep is manually invoked. I am pretty sure that resuming from sleep was an issue with the original Windows 7 configuration, so suspect that a BIOS setting needs to be tweaked. Before venturing into the BIOS, I would like guidance about what to look for or if there are registry settings that i should explore.