My Sony Vaio vpcf136fm is stuck at the black Vaio screen. I think this happened as the result of a failed BIOS or Windows update. I came home from work and the machine was stuck. I've tried recovering Windows via a Windows 7 64 disk, tried pulling RAM and rebooting, pulling the CMOS battery. With the Win7 disk, I was able to get to the Windows Recovery loader, but cannot get the keyboard to respond.