Old Pismo PRAM problem

i have on old pismo works "sometimes".... i'll explain.... if leave on standby works fine...but if there's power cut wont boot again (dead battrery) sooo!!! open , pull pram lead , boot.
next time round power goes , wont boot again...sooo ! open , replug pram lead...then it'll boot..... ad infinitum....
why ?

 

did ever reset pram (i don't know if makes sense because might volatile memory)?

 

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