Hello, since I've upgraded the BIOS to the version P11-B4 downloaded from Acer site, when I put my pc in suspend mode and then I try to re-activate it by clicking a key on the USB mouse/keyboard I immediately hear a 2 seconds long beep, then the pc seems to be re-activated because the led on the power button changes from flashing to stable, but the monitor screen remains totally black. Even after waiting more, nothing changes and the only solution is to push the power button for 3/4 second and shut down the pc. When I restart the machine, all works properly and there's no problem. When I had the previous version of the BIOS and I put the pc in suspend mode, it did regularly reactivate by clicking a mouse button or a key on the keyboard. I have already upgraded the videocard driver (Intel HD Graphics 4400) downloaded from Intel site, but the problem still remains. In the BIOS power management options, I didn't touch the default options, ACPI power mode is on S3, Deep power off mode is enabled and wake on USB mouse/keyboard is enabled. Anyone that has the same problem or that knows how to solve it?