PC won't start up after clock speed change in BIOS.

I have a MSI K8T Master2-FAR (MS-9130) motherboard with 2x opteron 240 processors. I changed my clock speed from 200mhz to 233 in the BIOS. After doing this, my computer will not reboot. The screen is just black. Is there any way to get back into the BIOS and undo this? Any help would be greatly appreciated. Thanks, Greg

Problem Solved!!! I reset the CMOS Memory by pulling the battery. Thanks anyway…

Glad your sorted, another way you could have done this is by locating and removing the reset cmos jumper, tad easier that tryin to take the batt out, specially if its an awkward one that has a tight fit in the clips!