1. Switch the battery

2. make sure all the power connectors are plugged in correctly

2. Clear the CMOS memory before you turn on your computer again. There are 3 pins on the CMOS header, Pins 1 and 2 are for normal operations and pins 2 and 3 are for memory clearing purposes. Switch the jumper to pins 2 and 3, wait a few seconds, and switch the jumper back to pins 1 and 2 before you turn on the power supply and the computer.