how do i reinable it without any video? Or will this not happen?
This can happen, the simplest solution is to clear the CMOS data, either using a jumper on the mainboard, or by removing the CMOS backup battery for a while. It can also be done by performing the necessary key sequence blind to enter the BIOS setup at bootup and revert the setting. That's more difficult.
Is your system actually a B110? If so, the onboard graphics is Intel 865. The standard implementation for this chipset is for the onboard graphics to remain enabled if a PCI video card is installed, and a BIOS option to select the primary video from AGP to PCI enables a PCI card to be used as the boot display and Windows primary display. But this can be changed by the manufacturer of the motherboard according to their own wishes. http://www.intel.com/support/graphics/sb/CS-004712.htm
If the PCI card you're using does actually work, that suggests Dell might have done it differently. Normally if you just add a PCI card as you've done, the onboard video still operates as normal, and Windows finds the PCI card as a secondary display.
Also, if you fitted the PCI card to the PCI slot closest to the CPU, try another one. The first PCI slot often shares the same interrupts as the AGP (which the onboard video is using), and this can create a conflict.