I get the flashing folder on booting my MacBook, but only if it is not connected to a power source.

I have an early 2008 white MacBook, running Snow Leopard.  A few months ago the hard disk died, and I replaced it.  Now when I turn it on (or even wake it from sleep) I get the grey screen with the flashing folder/question mark.  However, when it is connected to a power source, this doesn't happen. (this is not dependent on battery as when unplugged, it doesn't start even if the battery is full)
I was hoping for advice on what the problem might be, and how I can sort it to use without being plugged in.
Thanks

Once a Mac becomes 4 years old, the PRAM chip's capacitor or battery is likely to go.     This is separate from the battery to affects it on the power lines.   Hopefully yours is a battery, since the capacitor is on the logicboard for those that have a capacitor, and are harder to replace.

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