I.e. dead battery. So you need a CR2032 lithium button battery with either the solder lugs attached or a battery holder which you solder to the PCB and insert a CR2032 into it. The battery holder (which is what you use to do the battery mod) needs to be the horizontal style and ...
CMOS checksum error or CMOS battery loss First step, I would do a CMOS reset. Power off PC, Disconnect the AC power cord, Press the power button for 10 seconds to drain any residual power. Open the case and locate the CR2032 coin cell battery on the motherboard...