Panic: We are hanging here...   -- Wont boot after update..?  Please help

Hey..
I installed this update last night, it said powerbook 15" security update. So i installed it as usual and then, worked for a bit after it was done. Then hit the shutdown button.
This morning i go to turn i on, and, It freezes, up. and Displays the following.
panic(cpu 0): Unable to find driver for this platform: "PowerBook5,4".
Latest stack backtrace for cpu 0:
Backtrace:
0x00083498 0x0008397c 0x00276EE4 ect....
Proceeding back via exception chain:
Exception state(sv=0x008c1000)
PC=0x00000000; MSR= ect ect.
Kernal Version:
Darwin Kernal Version 7.9.0:
Wed Mar 30 20:11:17 pst 2005; root:xnu-517.12.7.obj~1/RELEASE_PPC
No Debugger configured - dumping infomration
MSR=00001030
Lists the same information again
panic: We are hanging here...
It is a 15" powerbook g4. I tried taking out, / changing the ram, Booting holding S, holding shift. I cant get ti even turn on. Any help would be awesome..
Powerbook g4 1.5 15"   Mac OS X (10.3.9)   2 gigs of ram

Hello may:
Welcome to Apple discussions.
Boot from your software install DVD and run repair disk from the disk utility.
Barry

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