I have installed windows-7-professional and ubuntu-14.04 on my computer. After installation of both OSes, the display became purple while choosing Windows 7. I tried to fix it using the boot-repair option as given in Boot Repair. The problem was solved once only.
When I moved to Windows next time, again display is just a purple screen. Its real head ache to do boot-repair all times. The URL associated with boot-repair is http://paste.ubuntu.com/15462929/.
I would like to add more info on my problem. During startup, my grub shows two Windows loaders, on sda1 and sda2 respectively. It is interesting that Windows always has a perfect display without any issue on one of these two loaders.
Suppose, loader on sda1 works for now, next time loader on sda1 will not work, but loader on sda2 will work. It switches always. I tried at-least ten times to confirm. Once the windows loaded, then every thing will work fine. Facing problem in startup screen.
My computer boots in UEFI mode (if it has any importance).
You may have UEFI firmware BUT your disk is not GPT style. You are using MBR booting and CSM (BIOS emulation) in firmware by default.
The system report given by your link says that sda1 is System Reserved and marked as active (boot) partition. This is the place where Windows boot files should be stored.
To fix this issue:
bootmgr and /boot from sda2 (using a Linux Live CD)Use a Windows 7 DVD/USB to repair Windows booting.
Use a Linux live CD to reinstall GRUB.
How to Repair, Restore, or Reinstall Grub 2 with a Ubuntu Live CD or USB
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