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My Power Mac G4 started to run slow and slower, gave time and date messages to check it it would run . I put new battery in and two weeks later came up again. I decided to reinstall my original OS X Disc got about half way through the install and quit said it failed message, I tried it again same thing failed. Can you help.

Michael, please check the date on the battery first. It may have new but old stock. Were the date and time holding? Will it start in safe mode (hold down the Shift key on start up). This does sound like failed hard drive.