Gros gros ^probleme power G4

Bonjour voici ce que m affiche l ordi quand je demarre.......merci de m'aider ça serrait super sympa....bisous/

panic(cpu 0): Unable to find driver for this platform: "PowerMac3,5".

backtrace: 0x0008bc14 0x00029f80 0x001f38f8 0x001d625c 0x001d606c 0x001d6adc 0x001d717c 0x001c762c 0x00036c00 0x00036b34

No debugger configured - dumping debug information

version string : Darwin Kernel Version 1.3.7:
Thu Jun 21 21:16:02 PDT 2001; root:xnu/xnu-124.13.obj~3/RELEASE_PPC

DBAT0: 00000000 00000000
DBAT1: 00000000 00000000
DBAT2: 80001FFE 8000003A
DBAT3: 90001FFE 9000003A
MSR=00001030
backtrace: 0x0008bd40 0x00029f80 0x001f38f8 0x001d625c 0x001d606c 0x001d6adc 0x001d717c 0x001c762c 0x00036c00 0x00036b34
panic: We are hanging here...