Cant boot into windows after installing ubuntu

Solution 1:

The Monitor is saying "Attention 92K/58HZ Frequency out of range." This means the monitor is not able to display the Grub menu as the Grub is sending it in a form that the monitor can't recognize.

Try the following:

gksu gedit /etc/default/grub

Uncomment (delete the # from the beginning) the following line.

# GRUB_TERMINAL=console

Save and exit gedit.

Use the update-grub command:

sudo update-grub

Reboot.

If at any of these setting changes the computer becomes unbootable, you will have to boot from Ubuntu Live CD (Try Ubuntu) and revert the changes in /etc/default/grub in your hard drive.

Explanation: When you boot the computer first the BIOS loads. Then GRUB loads. At this stage no OS is loaded and the computer has limited graphics capability. By default GRUB assumes the monitor can handle some graphics without the help of CPU, as most modern monitors can.

This monitor is very old and cannot handle the default display resolution of the GRUB menu. So it was showing the error message while GRUB was trying to show the menu choices. Since you couldn't see the menu, you waited till GRUB timed out and loaded the default OS Ubuntu. By commenting out the line GRUB_TERMINAL=console we told GRUB to display the menu in old "text-mode" style that your monitor can display without any help from the CPU.