CentOS

Hi,
I replaced my graphic card and my Redhat 6.0 box getting a black screen during boot. How can I solve this problem? Thanks a lot.

Is there a reason you can't upgrade to a later 6.x version? 6.0 is old. Also, I would recommend getting rid of the quiet boot, so you can see what's happening on the screen. You can do this by hitting escape as it boots.

You don't say what type of video card. If it's an NVidia card, you may need to get the driver, especially if you were using, for example, an older NVidia card with its driver and have updated to a newer NVidia card that takes a different driver.

6.0? Do you also run Windows 98?

6.0 came out in 2010 so you haven't updated in 8 years? There are so many security vulnerabilities in 6.0 that it's doubtful if the system is even yours any more. You need to update it - current 6.x is 6.10.