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It might be your GPU. Try going to System Preferences->Energy Saver and changing the "Graphics" setting. If it was on "Better battery life" then set it to "Higher performance", and vice-versa if it already was on "Higher performance".


http://forums.rolandclan.com/viewtopic.php?f=54&t=45738 On my A49 you have to hold down the "Function" "Pitch" and "Assign" buttons on the keyboard all at the same time as you power it on.


Your machine is now 10 years old, so there's definitely the risk that your PRAM backup battery has "worn out" and is nearly dead now. The life expectancy for these kinds of "coin cells" is normally about 10 years. So if you disconnect your Mac from the power supply for an "extended time" you risk that it fails to back up the PRAM. A battery loses its charge ...

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