You have two hard drives - sda has windows on it - sdb has Ubuntu on it. Make sure that the BIOS utility is giving sdb the boot priority. At the Grub menu select Advanced Options for Ubuntu. Then select a Linux kernel with Recovery mode.
At the recovery menu select Network to set up an internet connection. Then select Root. That will give you a root shell prompt where you can run
Code:
update-grub
grub-install /dev/sdb
When finished type exit to get back to the recovery menu and select Resume to load Ubuntu with a low resolution open source video driver. If you get that far - reboot to load Ubuntu with your normal video driver.
See how that goes.
Regards
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