Unplug everything you can from the machine - CD rom drive, hard disk, one stick of RAM, the battery, any external device. Then plug them in one at a time until you get that error. Then you'll know what's causing the conflict.
Looks like the System managment part of the BIOS seems to be corrupt and or the DMI is corrupt.
Sometimes We Miss the Obvious Dept. You did try resetting the BIOS. . "Set BIOS Defaults" or similar, right?
Or if you get into Setup. . disable everything you can. . . I don't know what is at PCI 3, probably Audio, but could be NIC (unlikely, usually at 1) or Modem-- probably audio.
Otherwise you pull the BIOS battery. Or you could try a re-flash to clear the DMI
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