Powerbook G4 15inch Cuts Out

Help please
My trusty Powerbook G4 suddenly cuts out. When I power on again I get a small widow saying computer
clock is set to a date before March 24 2001 This may cause some applications to behave erratically.
The clock is displaying the correct time and date so I do not understand what I should do.
Can anyone help me
Thank you.

You may have your computer set to correct the time and date via your internet connection, so the error message may still be correct - it's just fixing the time after giving the message. If so, it usually means your PRAM battery is dead, which is a small rechargeable battery (not the main battery) that retains the time and date when you change main batteries. Sometimes, you can recharge the PRAM battery by leaving the AC power connected for several days. If not, it needs to be replaced.
The "sudden cutting out" is too vague to offer much advice. Is this while running on AC or battery power?

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