Question about Dell Latitude C640 Notebook

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Cannot get the option to enable VGA through using F8 at windows S

I disabled the Onboard VGA through BIOS and restarting hoping my ATI video card would get some response. It still doesnt show up i think i need to change the drivers, recently installed new motherboard. I cannot get any options from using F8 and startup just keeps blank screening and giving me the 3 beeps saying no VGA detected, any other way to reset the BIOS options without seeing them? haha, thx

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  • inflames_for Dec 18, 2008

    no the motherboard worked fine, i was using it before i turned off the onboard VGA but was just trying to get my PCI video card to work and ended up not being able to get back into BIOS or Windows because i simply cannot see anything when i turn the computer on. Will removeing the motherboard battery set the mobo back to factory default settings? I have a backed up version of the original BIOS and an updated BIOS saved on a portable USB drive but problem is i dont think i can access them because i cannot get any response from VGA whatsoever.

  • inflames_for Dec 18, 2008

    oh and also my comp has nothing to do with DELL labtop, i accidently posted this under that, im using a PC Desktop, if information on it would help let me know

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Sometimes after changing BIOS settings the computer will not start or will possibly give error messages similar to yours. I have at times had to remove the power source, remove the motherboard battery, and set the motherboard back to factory default settings. You also stated that you installed a new motherboard. That could also be a potential problem. If the computer has never started with the new motherboard, the new board may be defective.

Posted on Dec 18, 2008

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4 Answers

How do you enable onboard video card in bios




Here's what others have tried.
I like the jumper and cmos and enable/disable portions


avatar-default.png Posted bylesleymillar on 11 Oct 2009 8:00 AM Just fitted a new PCI graphics card (Radeon 9200) in my 4 year old Dimension 2400. The only way I can get it to work is to have both it and the on-board graphics chip running together - done this by selecting the Radeon as the default display and by not having the Windows desktop run over onto the Intel display. Problem: If I disable the on-board graphics chip as per the fitting instructions and then set my Bios to auto select, the computer boots and is active but all I get is a blank screen regardless of which output the monitor is connected to. Also, as I have the Radeon as the default display in Windows I don't see anything (no Dell boot screen, etc) when I switch my machine on until Windows log on screen as I have to have the Bios set to 'On-board' in the graphics option otherwise the aforementioned problem persists. Has anyone else encountered this problem, and if yes, has anyone managed to overcome it i.e. successfully disabled the on-board chip? Unfortunately there is no Bios upgrade from Dell that allows a user to select either auto, on-board AND PCI - the last one being ideal it would seem!
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  • avatar-default.png Posted byrdunnill on 11 Oct 2009 4:58 PMI just configured a 2350 with a PCI card (Sparkle 8400GS), and I left the BIOS setting at auto-select. (I could find no way to disable the onboard graphics.)
    I found that if Windows installed a driver for the onboard graphics before the PCI video, the onboard graphics were used for the default monitor. Thus, I got no image from the PCI video. I connected a second cable to a spare DSUB port on the monitor to the onboard graphics and switched inputs until I got video. Then I downloaded the appropriate video driver for the onboard graphics, installed, and rebooted. Upon reboot, I switched the default monitor from the onboard graphics to the PCI video, after which I could remove the second video cable.
    Hope that helps!
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  • 4tjv4usnef6m.jpg-32x32.jpg?m=634535492957260780 Posted byJackShack on 11 Oct 2009 6:32 PMSome additional information that may be helpful:
    1. The Dimension 2400 uses an on-board AGP graphics chip that cannot be disabled in hardware. It shares the interrupt for the first PCI slot which can give you trouble if you decide to place your add-on PCI graphics card in slot 1. My own add-on card wound up in slot 3, so it might be helpful to switch to another slot before giving up.
    2. If you do have your card in slot 1, try resetting the NVRAM (CMOS) by removing the battery for about five minutes. You can find instructions for that here: Dimension 2400 Service Manual. Look in the section on Removing and Installing Parts, Battery. While the battery is out and everything still unplugged, push the power button and hold it in for about fifteen seconds to ensure the discharge of any storage elements. When you put the battery back in its holder and fire everything up again, the computer will take a new inventory of its devices and will sometimes finally find the PCI video card.
    3. This next you've probably seen, but it bears repeating: Before attempting to install the new card, go to the Device Manager, Display Devices, and find the Intel Graphics Adapter. Double click it to bring up its properties, go to the bottom of the little window to Device Usage, and click the small arrow on the right to get the menu. Select "Do Not Use This Device - Disable". This will disable the onboard driver and cause the computer to load the standard VGA driver that works with all the video cards. Sometimes the reason you see nothing on the add-on card is that Windows is still trying to use the driver for its previous video adapter which is incompatible with the new card.
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    Dell Forum member since 2005
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  • avatar-default.png Posted byrdunnill on 11 Oct 2009 7:40 PMIt might help to disable the onboard video in Vista, as ATI drivers can clash with it and cause BSODs. Under XP it'll co-exist.
    There is a jumper on the mainboard for clearing the CMOS. It is marked as such, and the manual will point it out.
    The default Windows driver for the add-on card will work, but without acceleration and with a very low resolution. Also, if Windows installs the driver for the onboard graphics first, it will mark the onboard graphics as the primary display.
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  • 4tjv4usnef6m.jpg-32x32.jpg?m=634535492957260780 Posted byJackShack on 11 Oct 2009 9:10 PMYes, I neglected to mention that if you get the card to work in the VGA mode you should be able to install the specific driver for the card. In the past I have recommended that no attempt be made to load the driver for the card until a VGA screen can be displayed.
    Granted there is usually no conflict if the onboard driver is left in place; the problem arises when the BIOS sort of recognizes the new card but for some reason Windows fails to find a driver for it. In this situation you get video from neither the onboard port or the PCI video card port. This seems to happen a lot if the card is installed into slot 1. In the past I've corresponded with folks who seem to be able to get the card to work only by using the Windows multi-monitor capability; extending the screen onto the video card. The only irritation with this is that you get no video until Windows loads, so if you want to see the system setup screen you need to switch ports.
    Naturally I realize that a jumper is there and is supposed to work, but removing the back-up cell makes certain that the NVRAM will be cleared.
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    Dell Forum member since 2005
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  • avatar-default.png Posted byrdunnill on 11 Oct 2009 10:40 PMThe jumper definitely works, as I used it last week several times in dealing with a recalcitrant 2350.
    Windows should find a driver for any VGA-compatible card; it'll be a default VGA driver. However, if Windows can find the driver for the onboard video, it will use that as the primary video, regardless if they are connected or not, and the user will get no video from the PCI card. I had this problem with the 2350, and had to temporarily install a VGA cable to connect the onboard video; after installing the drivers for the PCI card, I'd switch the primary monitor to it and all would be fine.
    When I installed Vista on the 2350, I experienced BSODs on startup until I disabled the onboard video. I am not sure if this happens with nVidia cards as well as ATI ones.
    I tried two cards with the 2350: an expensive HIS 4350 ATI and a much cheaper Sparkle 8400GS. The 4350 worked, but did not accelerate video playback (ATI said they did not support it over the PCI bus), so I RMA'ed it. The 8400GS installed without incident and worked perfectly and accelerates both standard and high-def video. Both cards were installed in slot 3.
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1 Answer

No signal to monitor


  1. Verify card is seated properly.
  2. Check bios settings. ie. disable onboard video, enable PNP OS installed, enable "assign IRQ to vga", disable shadowing and caching, enable passive release, enable delayed transaction, vga boot sequence: AGP, set graphics aperture size to 128MB, disable turbo modes.
  3. Verify power supply is at least 350 watts.
  4. Reboot into safe mode (press F8 right after the BIOS POST screen and before the windows loading screen) and use the program, Driver Cleaner Pro to remove Nvidia video driver remnants. Don't select all of the options, just the Nvidia driver and the plain ATI selection.
  5. Verify the monitor cable is securely connected to both the monitor and the computer.
  6. Verify that you have connected the cable to the vga port on the card and not the onboard vga port. (I'm not implying that you are dumb or anything like that, but sometimes even the best of us, overlooks the simple things... especially me! LOL)
  7. Verify the monitor cable is good.
  8. (Last but not least), try using another monitor to test. (Could be an incompatibility with the monitor.)


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