Lenovo C560 BIOS corrupted

[SuperCPlus]

I have read quite a bit on recovering my BIOS (Insyde BIOS) but having trouble getting a fd file.  If I could get an fd file, then be able to boot into Windows 8.1 - I think) I could update the BIOS from Lenovo

I have an AIO Lenovo C560 - won't boot - black screen - but have power to fan, hard drive. (OutOofWarranty by 6 mos)   I think my BIOS is corrupted.  I have Andy's Phoenix tool, downloaded the BIOS exe file from Lenovo, extracted files using 7-ZIP, but no file in there that is found as a "BIOS" file.

I have a 16 GB flash drive.  One already has 3 DOS files needed to flash from USB.  But it needs a BIOS file...?  I am stuck.  Any help is much appreciated.  I am somewhat techie....but this is new stuff for me.  Thanks!