ok.. i have managed to "fool" my laptop..

it turns out that this laptop UEFI implementation is so buggy.. i even have difficulties in installing win8.1 in UEFI mode.. ( i never thought that before this, i used the legacy mode to install win8.1 )..

my solution is, after creating the liveCD USB, i just delete the EFI folder in the USB.. this force my laptop to boot ISOlinux instead of grub.. and after that, i can install elementary OS without any problem ( no more grub-install failed )..