cadaveca: this issue is only for boot and in windows OK? Did you tried to get to BIOS? In BIOS will be keyboard working? All keyboards are USB keyboards? Thank you.
TheMailMan: keyboard RAZER Black USB Wired Lycosa Mirror Special Edition , wow! I have one noname redstart USB keyboard and it working at all M4 series/M5 series and C5 series (what I had at reviews). Second my keyboard is microsoft sidewander and with my old C5F and new C5F-Z working OK.
PC1:AMD Phenom II x6 1090T BE@4300 MHz stable !!, ASUS Crosshair IV Formula, Xigmatek 1283 DK, 650W Seasonic, ASUS HD 5770,2x2 GB A-Data 2000X, 1x Samsung F3 500 GB PC2:AMD Phenom II x4 955 BE 3915MHz+2680MHz NB 24/7 or AMD Phenom II x4 965 BE C3 4030MHz 24/7 aircooolong CM Hyper 212, 2x2 GB DDR2 1066 MHz, MA790X-UD4, saphire HD3870 512MB, 2xWD 320 GB, Samsung 1823 DVD-R/W, case Aspire X-cruiser
benchPC:second Thuban 1090T , x4 970 BE and new i7 980x + ASUS Rampage III Extreme