Display problem fixed with PRAM reset????

My 1.5G 15" Powerbook G4 had a weird fuzzy messed up display when started today. Shutdown and restart didn't help. I read in Support a video problem might need a PRAM reset. So I held down the Command-Option-P-R keys during restart and display looked fine. Might just be a coincidence so I'm wondering if this could have helped the problem. If so does it need new internal batteries? Can they be replaced by me? Are there instructions somewhere? Are there two batteries called System and Backup?
Phil

Hi, Phil. Some display settings are stored in PRAM, and resetting PRAM restores them to their defaults. There are some other settings that can affect the display's appearance (notably in Universal Access) that may not be wiped away by resetting PRAM, but evidently your problem was traceable to something that had been stored in PRAM — probably a reduced resolution setting.
Unless you have some other indication that one of your PB's batteries — which are commonly called the main battery and the internal backup battery — is bad, there's no need to replace them.

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