I have an Acer Aspire All-In-One 5600U. The other day the power in our home went out due to a storm. After it came back on and I went to use my computer, the screen was black and said "Reboot and select proper boot device . . .". I tried downloading the media creation tool to a USB and booting up using this. I can get into the Troubleshooting menu but nothing works. When I attempt to do a custom install of Windows , it says "no signed device drivers were found". Is this a hard drive problem? In the BIOS, under Boot Options is does not list a specific hard drive. It just says "hard drive". Thanks in advance for any help or suggestions.