Hi, I have an HP ProBook 4540s with Intel Core i5, AMD Radeon 7650M and Windows 8.1 x64. The problem is that the notebook can't enter in sleep mode.When I click on the Sleep button on the screen after 10 seconds its just restarts and boots into the Windows.When I have the fast startup enabled I have the same problem the screen goes off and then restarts after 20 seconds. The main issue is caused by AMD driver beacuse without it can resume from sleep, and Fast Startup its working. I tried older versions but nothing now I have the latest beta driver. (older versions from HP Support) Thanks you!