Yes make sure its unplugged from the wall and ground youeself to the PSU so you don't do a static discharge to the motherboard. Also you might see a jumper with coms next to it with 3 prongs move the clip to the one thats bare and the middle one and it will clear the battery without taking it out. Now put the jumper back where it was before you moved it, plug it bak to the wall and give it a try. I can't tell you how important it is to ground yourself to the PSU.