[ubuntu] Windows 7 and ubuntu Dual boot issues

Hi,

I have a lenovo G50-80 laptop. I have fresh installed Windows 7 Ultimate 64 bit and Ubuntu 14.04 for dual booting. Ubuntu boots fine. Now the issue is, when I select Windows 7 from Grub 2 menu, the 'Starting Windows' screen does not appear. Instead, I can see a screen with distorted colors all around the screen. After some time the screen goes blank and I can hear the windows Login sound.

I understand that windows is booting fine but the question is Why can't i see anything on the screen?? I can press Alt+F4 and Enter to shut down the computer as well.

I have tried to resolve it the following way:-

Deleted all partitions from the hard disk -> Recreated the partitions -> Installed Windows 7 -> Restarted the computer number of times to check if Windows boots normally.

Windows successfully booted and I could work on windows without any issues.

Now I installed ubuntu 14.04 again (this OS has GRUB 2).

After this re-installation ubuntu 14.04 boots absolutely fine but the issue with Windows 7 comes back. I am unable to understand why this is happening and how to resolve this issue.

I have installed Windows 7 and Ubuntu 14.04 (same installation iso in both cases) in my desktop as well. There is no issue in the desktop computer.

Any help will be much appreciated.