Yes Ive tried a few times now tapping F8 and nothing..
I took the battery out like you said but the laptop wouldnt power on at all without it
And no it literally comes on the acer screen then once the bar has loaded at the bottom it goes onto the black screen and stays there.
On the acer screen it say press F2 to enter set up and F12 to display boot menu, I dont know if any of this helps?