The battery is 3.7V. The volt meter measured until 2.5V. According to this apple link http://support.apple.com/kb/TA35928 the battery must be changed. But when i turn on the computer, i hear the starting sound and the hard drive starts spinning but until there (it doesn't continue booting). The power supply is cold (i have left the performa on about half an hour), the cd rom drive can be opened and closed as many times(with a cd or no cd inside) as i want and the diskette stays inside the floppy drive. Can the pram battery cause all these?