Redhat(xwindows) doesn't like my Laptop Screen
I have a new emachines M5312 and I installed redhat on it. I went online and found the settings I needed to change in XF86Config file to get it to run xwindows. Everything was working fine. Then, I used apt-get to update/upgrade my system. Afterwards, whenever xwindows loads, the screen goes dead and flickers every once in a while. I went to the XF86Free log file, and it appears that the computer was trying out many video modes but then rejecting them for various reasons(horizontal or vertical refresh is out of range or sync, or some other reason).
Is there something else I need to change, or do I need to reinstall redhat again(this would be the 3 time) and not use apt-get. I like apt-get a lot and don't really want to be without the ability. Not to mention the my video card/screen shouldn't be doing this.