G4 17" aluminum on 10.4.11, what's the newest OS version it can use?

Question

I have an old powerbook g4 and it's been on 10.4.11 for a long time, there's a few things I wanted to run but they won't run on the old OS, what's the newest I can upgrade too?
Anyway to find out if my applications will function above 10.4.11?
If not I'm not sure I want to bother.
I also heard that there was a rebuild option, for a few hundred they'd replace anything that was damaged.
Here's the info from the system profiler:
Hardware Overview:
Machine Name: PowerBook G4 17"
Machine Model: PowerBook5,7
CPU Type: PowerPC G4 (1.2)
Number Of CPUs: 1
CPU Speed: 1.67 GHz
L2 Cache (per CPU): 512 KB
Memory: 2 GB
Bus Speed: 167 MHz
Boot ROM Version: 4.9.1f1
Serial Number: W8510-----
Sudden Motion Sensor:
State: Enabled
Version: 1.0

Answer 1

The highest OS you can run is Leopard 10.5.X. 10.6 cannot run on a PowerPC processor. With the clock sped andRAM you have plus the video chipset (should be a Radeon 9700 with 126MB VRAM) Leo should run well.
Anyway to find out if my applications will function above 10.4.11?
If there is a particular third-party application that must run under the higher OS, you'll need to contact the developer. You could ask in the Leopard OS forums but I suspect you'll ge the same answer. Most apps that work in 10.4 should work in 10.5
I also heard that there was a rebuild option, for a few hundred they'd replace anything that was damaged.
The "flat-fee" thing is the "Depot repair." It repairs things that are worn/failed but "damaged" is a little different. It's my understating that the computer qualifies for depot repair if it shows no evidence of physical damage. Dropped or dunked computers need not apply, You'd also need to check to see if the depot repair is still available for a G4. Your model still shows as "supported" from a service standpoint, but what the depot can do depends on parts available.