System Fails To Boot

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http://www.linuxquestions.org – This is my first post to LQ. I've used Linux since RedHat's first free release. My system is dual-bootable into Sabayon Linux (a Gentoo distribution) and Windows 7 64-bit. The system was new several months ago. I have kept Sabayon up-to-date with rolling updates on a weekly basis. I have booted daily into Sabayon Linux and seldom into Win7. However, several nights ago I booted into Win7 and used the system for several hours. I then rebooted. During reboot the monitor literally showed "GRUB loading.." (minus the quotes) and failed to progress. I have used a Sabayon Linux LiveDVD (HowTos)