Powerbook G4 12 died all of sudden

[flatjuba]

My powerbook G4 12 inch just died all of sudden, the screen went garbled then black. When I tried to turn it back on, it made an attempting sound of powering up, but nothing. No chime, let alone the apple logo. The battery is still 90% full. I took out the battery, no avail. I pressed command, control and power button altogether, no avail. Safe mode, no avail.
Does anyone ever experienced something like this?

 

[maître]

Sounds like a dead motherboard. Try using an external display if it still makes a chime. If something comes up, might be a good idea to reset NVRAM. If the screen goes all glitchy again then it's the GPU, so a motherboard replacement anyway.

 

[ervus]

Did you try removing the RAM module?

⌘ + ⌥ + p + r at first power on should reset the nvram and ⌘ + s at boot can sometimes boot you into single user mode, even with a failing GPU. If it won't do that then it might be dead. Does the LCD backlight come on? USB port power? If not it could be a power problem.

 

[TheShortTimer]

It's also worth seeing if FireWire Target Disk Mode works. I've got an iBook G3 that doesn't display an image on the LCD or via an external monitor but I can access its HDD over FireWire from another Mac. If you're able to do the same then you can narrow down the issue to GPU failure.