Powermac authentic G5

Product Name: Powermac authentic G5
Apple Powermac G5 desktop dual 1.8ghz Comes with keyboard and mouse I have at times able to get it on then other times it doesn't When it is on it functions fine. Possibly needs the small battery. I know it hasn't been replaced since we purchased new. The battery is around $15.00 and looks easy to replace The monitor does not go with this Could be used or for parts Note-Oct 24,2021 I did get it to power up. I pressed the authentic pram button inside then while booting the computer up I pressed on the control, command, P and R I then installed the original install discs then tried to start it after and the computer came on fine.