I have a IIsi that wouldn't power on.  I replaced the power supply,
and now it will turn on, but won't boot.  Power comes on, hard drive
spins up, monitor turns on, but there's no boot sound from the speaker
and I can tell from the hard drive that it's not booting.

Can this be the PRAM battery?  I replaced it about 5 years ago, so
it's not the original.  I check the voltage, and it's reading about
3.6 volts, but maybe it's not supplying enough power.

Will the IIsi boot if the PRAM battery is dead? Anything else I can
check?

Thanks.

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