RAID Lv 1: Grub fails to install!

[compdoc]

> Installation continues (default partitioning) till the end, I boot the
system and  ... black screen!

Are you saying it begins to boot and ends at a black screen? Do you seeing
any booting progress before the black screen? Please describe...

> no, its not from the video card cause a prev install showed up fine :-)

A previous install of what showed up fine?