I have a laptop with Windows 8.1 update 1 and I installed Linux Mint 17 trough dualboot and everything worked great so when I start my laptop I get a Grub2 bootmanager window where I can choose between Windows 8.1 and Linux Mint. A couples of weeks ago there was a new update for Ubuntu (Ubuntu14.10) so I tried to install it over Linux Mint. Ubuntu 14.10 was installed and I had to reboot my laptop after that I got a message: "Grub resque". Finally I found a way to bypass the grub2 resque error so I could start Linux Mint 17.1 Live cd (trough usb) and installed Linux Mint 17.1 on the sda5 partition (I format Ubuntu completely). So I solved the Grub2 resque error by creating a new partition with bios_grub flag (2mb) because the previous bios_grub partition was deleted. The only problem I still get is that when I start my laptop he boots into Windows 8.1 so I have to start my laptop and push F11 for the BIOS Boot Manager and then I can choose between Windows boot manager or Ubuntu or ubuntu (when I choose Ubuntu or ubuntu the Grub boot screen appears and I can choose Linux Mint 17.1 rebecca). So the problem is I get no Grub2 boot menu when I start my laptop (also push shift doesn't works). The problem begin after installing Ubuntu 14.10 over Linux Mint 17. I tried to install Lubuntu, Kubuntu, Fedora and Linux Mint Debian Edition but everytime I start my laptop it start straight to Windows 8.1. I tried grub-customizer to change some settings but still no grub2 window when I start my laptop.
My boot info script from Boot-Repair is on the url below.
I hope my question/problem is clear now. Big Thanks.