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UEFI Boot fails on DZ77SL-50K

If I deactivate "legacy boot" in the "visual bios", the PC isn't booting anymore. I can't see anything on the screen I just hear 2 beeps. To fix it I have to change the jumper position and tick the "legacy boot" option back on. Why is it neccessary to do so? My Hard Disk is a 3TB one and I installed Windows with UEFI.

The BIOS version is:

SLZ7710H.86A.0097.2013.0430.1647

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