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Installing graphics card in Dimension 2400

I have a Dell Dimension 2400 with onboard graphics that I wanted to try installing a graphics card in.  The graphics card is a Radeon 9250.  Installed the drivers and then the card, but on reboot, the Windows splash shows and then the screen is blank.  I have seen other info. that says to disable the onboard graphics controller in Device Manager.  Others say to disable onboard in the BIOS, but the skimpy BIOS doesn't give you that option.  My question is this:  If I disable the onboard graphics in Device Manager and then the Radeon Card doesn't work for some reason, will I be able to get back to and re-enable the onboard graphics in Device Manager?  
(The new Radeon card is showing up in Device Manager as working properly.)

Thanks
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rstorm1
Asked:
rstorm1
1 Solution
 
nobusCommented:
i suppose so; check if there is a reset jumper on the mobo (3pins) to reset the Bios.
alternatively, you can take out the battery for 5 minutes, with power cord removed.
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jamietonerCommented:
Go into the bios and go to integrated devices and set the primary video controller to pci (if you rest defaults agp is the default and agp in this case is the integrated controller). This will disable the integrated video and make the pci 9250 the primary video controller.
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rstorm1Author Commented:
When I mentioned the skimpy BIOS on this Dimension, I failed to mention that there is no way to set the primary video controller to PCI.  The only choices you have are AUTO and ONBOARD.  The BIOS was already set to AUTO.  I made sure I had all drivers installed, then disabled the onboard graphics in Device Manager, then rebooted to the new graphics card, which seems to be working fine.
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