Unable to boot to Windows 7 successfully from the first try

Question

I had Windows 10 installed along Ubuntu, and would choose from grub loader.

I later uninstalled Win 10 and installed Win 7 in its place, I updated grub in Ubuntu but the Windows 10 entry in grub did not go away.

I now have two entries, both entitled Windows 10, one in /dev/sda1 and the other in /dev/sda2.

Both load Windows 7, but not on the first try. When I initially load it, the screen is dark, while Windows has loaded in the background (I can hear the sounds).

I have to power-off the computer, then choose Windows again for the screen to work. Sometimes I have to repeat this more than once.

I don't know much in Linux so I can't tell if the problem is from Windows or grub.

Answer 1

This question is a duplicate of GRUB2: black screen when booting Windows but cannot be closed due to bounty rules. The solution as confirmed by OP in comments is:

sudo gedit /etc/default/grub

Search for the following and change the second line to look like:

# Uncomment to disable graphical terminal (grub-pc only)
GRUB_TERMINAL=console

Save and exit then run:

sudo update-grub

Answer 2

The terminal option isn't relevant.

If you've run sudo update-grub and the results are inconsistent, That points to a hardware problem with the storage media. I highly recommend that you check the status of your /dev/sda drive as you may have failing sectors buried under the MBR or under your /boot/grub/grub.cfg file.