My PCI-E cards are not detected by my computer!!! I think I need to disable onbo

I have made it work before by setting "memory buffer size" to "disabled" in BIOS. (I think)

But it won't work anymore and I have to use my onboard video.
Does anybody have any ideas of how to fix this?
Maybe flashing the BIOS?
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More about cards detected computer disable onbo
  1. Post your system specs.
  2. Emachines W3107
    Motherboard K8MC51G
    1.5gb ram
    1.8ghz processor
    nvidia 6100 onboard video
    trying to get a pny 8600gt on (but my old 7300gs doesn't detect either, although it used to)
    300 watt power supply
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