I am having a similar issue with my logitech g510 keyboard and z77-ud5h mobo. It is powering on at post but I am unable to get into the bios. What do you mean by "jump the jumper"? I am in need to fix this problem because the boot disk is set first so booting to the dvd drive or usb is impossible.
as i know the latest bios can fix logitech g series keyboard problem on z77.
Ive considered upgrading to the F8 because of its better range of peripheral support but how would I be able to access the disk or thumbdrive the install file is located on if i cant change my boot sequence?