grub2 problems on a new computer

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http://www.linuxquestions.org – I have been having some minor problems with grub2 lately - grub is installed in /dev/sda the only HD on this machine. When the grub menu comes up after a boot/reboot I cannot select certain items as the selection bar just skips by them. Usually I can select them if I start at the bottom and then they will not be skipped, but others will. Another problem which may be related - if I try to edit one of the items before booting, I get double characters (like ssiinnggllee). This is a relatively new Fedora 19 installation, with a USB keyboard. I updated the machine's BIOS in case there was a pro (HowTos)