IBook 700MHz powers on only sometimes - why and what's wrong with it?

My daughter owns an iBook 700MHz with Combo drive and 640MB RAM. It's 3yr Apple warranty ran out in Aug 2005.
Her iBook has started to play up as it will not boot up most times when the power button is pressed. Every now and then it does which obviously makes her iBook unuseable. This is true whether the power plug is connected or not. The iBook battery is in good shape and charges up AOK.
I want to repair this iBook but am at a loss as to what parts to order. So if anyone knows this to be a common problem could they post back what this problem is and what parts I need to order to make good on the repairs. I'm not bothered about getting inside of the iBook as I've replaced my son's iBook HD a few months back.
Thanks for any insights and feedback.

This may be a longshot, but perhaps Reseting the Power Management Unit will solve the problem. The KB article notes
Over time, the settings in the Power Manager may become unusable, which can result in operational anomalies with the computer. Examples include not turning on, not waking from sleep, not charging the battery, or not seeing the AC Adapter, among others.
Good Luck.

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