Not using Windows, I just installed Ubuntu on this new G770 wiping all previous partition in the process.
Now when powering the laptop, the power light goes on but that's it, no display whatsoever, mechanical noise coming from it, nothing. Can't access the bios.
The drive partition table is GPT. I created a fat32 partition in first position and set the flag to boot (partition type is EFI, checked with gdisk type ef00). Then an ext4 / , an ext4 /home and a swap.
The installer warned me that with this partition table format in use I should normally have a separate partition for the boot loader code, also it nay still be possible to install the boot loader to a partition. I ignored that, did not create one and went one the installation process.
It completed nicely. I then installed grub-efi-amd64 and all is working perfectly on this laptop, the system now works just fine.