I just bought a new ASUS computer with WINDOWS 8 pre-installed (so UEFI and secure boot activated) and it is no more working since I did a mistake with GDISK:
I wanted to install UBUNTU alongside Windows8 in UEFI mode, but the option did not appear in the Ubuntu installer ("install ubuntu alongside Windows").
So I decided (bad decision I suppose) to use GDISK in expert mode (x option), and I did "z" option: "zap (destroy) GPT data structures and exit"
by hoping I will have the "install alongside Windows" option in the installer.
And now, each time I start computer, the BIOS (UEFI) appears, and the PC block on it, Windows 8 no more starts.
Please can you give me a solution to restore GPT partiton table?
Thank you in advance.