How do I get fullscreen when booting up / in Linux / in DOS again?

When I first had my laptop, it use to boot up in FULL Screen. When I was in Linux (in console) it was also in full screen. It may of only been 80x60 but it was stretched to the edge of the screen. Now when I boot up or I am in console mode, everything is scaled down into the very center of the screen.

I've been trying to figure out how to get my "full screen" back again, but I can't figure it out.

I have an Inspiron 8200 w/ a Radeon 9000 Mobility.

Thank you,

Wes Weber