I'm using the DZ77GA-70K board with an extern graphic card (my screen has no HDMI). In this case everything works fine, but when i also connect a cardreader (SATA) my board isn't able to boot anymore. Any ideas?
The issue you are experiencing could be related to compatibility with the card reader (SATA) device you have. Our recommendation is making sure you have the latest firmware for the card and testing a different device on the SATA port to narrow the issue.