First, remove the RTC (Real Time Clock) battery and leave it out for 20 minutes. After this period of time, insert the battery back in and turn the system back on; if it displays POST messages, go into BIOS Setup Utility by pressing <F2> during the boot process. Once in the BIOS setup utility, press <F9> to restore BIOS default settings. Reset any customized BIOS settings. Press <F10> to save the new settings and reboot the system.
If the issue still persists, proceed with a BIOS recovery update to latest version 0113:
The latest BIOS version can be downloaded from the following web site:
I'm having a similar problem with a brand new DZ77RE-75K. I tried to update with a usb and f7 which seemed to work. When it reboots, it gets stuck at code 12 and doesn't show any video. Any idea what I should do?