I recently got red hat 8 and after the installation and reboot, it asks me to login. The screen keeps randomly flickering black, after a few flickers it goes to a screen saying it cant start x and then it lets me looks at the error and it says

no screens found

Motherboard: Winfast K7N415DA (based on nvidia nForce415D chipset)
Graphics card: winfast A250 LE TD (powered by nvidia geforce 4 ti 4200)
Monitor: CTX 1792UA

Also i cant get my raser boomslang to work, if i move the mouse it just moves to random spots on the screen.

try running "Xconfigurator" to configure your Xwindows again. Choose a conservative resolution and color depth as a test.. if that works.. run it again and tweak it up till you are happy with it.

-KevinJ