Bad idea changing pci cards when the board is live, if youre lucky and it works, look for a 3 pin terminal with a jumper on it labeled JBAT1 CLRCMOS or CLRCLK or similair, put jumper across the pin unused and then back again normally pins 2-3 then back to 1-2

You can bet that the motherboard is dead now. You should never plug or unplug any interior component while the PC is running and/ or plugged into any power source for that matter.

First shut down the computer, unplug it from the wall, wait a minute for any electrical serge to dissipate. Then it's okay to fiddle with the interior components.

Note: Most interior components are sensitive to static electricity, so use caution and avoid handling and/ or touching sensitive areas of components, i.e. PC Boards and conductive areas. Also, as precaution you should invest in a anti-static wrist band.