I am using Ubuntu 14.04 with no other OS alongside.
Normally, when I start the computer, it shows the Asus logo first and then go to the Ubuntu loading screen and finally to Ubuntu home screen.
Now it shows Asus logo first and then shows GNU GRUB purple screen asking me to choose OS (I've already mentioned that Ubuntu is the only one OS I installed in my laptop).
So I choose Ubuntu, hit enter and it goes back to Asus logo and to GNU GRUB screen again.
It happens this way again and again and again, in other word, it's looping.
GNU GRUB version is 2.02 beta2-9
GNU GRUB version 2.02~beta2-9ubuntu1
Advanced options for Ubuntu
Memory test (memtest86+)
Memory test (memtest86+, serial console 115200)
Above is what the purple screen looks like.
I tried the third option Memory test. Found no error till pass 3.
There are two options in "Advanced options for Ubuntu"
Ubuntu, with linux 3.13.0-27-generic
Ubuntu, with linux 3.13.0-27-generic (recovery mode)
When I hit them, both options show the black terminal-like screen for a second or two and then to Asus logo. It is also looping.
Some say to fix this problem using boot repair. And some say boot repair slow down the reboot process.
Sorry for long detail question and thank you all...