I have a Powerbook G4 that I have not used for a number of years. I believe there are photos on it that I want to retrieve. The unit will not power on and there is no evidence it is alive. Neither the wall plug in or a new battery helped. Suggestions.

If you give up on ever getting the PB to boot again, open it up, remove the drive, and then remove photos with a USB Universal Drive Adapter (such as those from OWC).

Try taking out the main battery and letting the PB sit turned off but plugged into wall power for 24-48 hours. Then reinstall the main battery and try a start.

When you try to start it, do you get any sounds, like the Mac "chimes" or hear the hard drive or optical drive spin up? If you get those sounds, try holding teh SHIFT key during startup; keep holding until you see a desktop and then lt go the key. Don't try using the comptuer at this point--it won't have all needed extensions loaded. Simply try a normal start to see fi that gets a regular desktop,

Do you have the system install/restire disks that came with the computer, or retail install disk? Both are bootable. Try booting from one of those optical disks. Hold the c key to force booting from the optical drive.