Leopard 10.5.5

Hi there,

Please could someone assist me as i am new to the OSX.
After reading a few forums - found out that the best OS to download was Leopard 10.5.5

I have a Acer Aspire 3050 Laptop and yes it supports SSE2 and SSE3 : here is the Processor Information using CPU-Z

Processor 1 ID = 0
Number of cores 1 (max 1)
Number of threads 1 (max 1)
Name Mobile AMD Sempron 3500+
Codename Keene
Specification Mobile AMD Sempron™ Processor 3500+
Package Socket S1 (638)
CPUID F.C.2
Extended CPUID F.4C
Brand ID 3
Core Stepping DH-F2
Technology 90 nm
Core Speed 1800.0 MHz
Multiplier x FSB 9.0 x 200.0 MHz
HT Link speed 800.0 MHz
Stock frequency 1800 MHz
Instructions sets MMX (+), 3DNow! (+), SSE, SSE2, SSE3, x86-64
L1 Data cache 64 KBytes, 2-way set associative, 64-byte line size
L1 Instruction cache 64 KBytes, 2-way set associative, 64-byte line size
L2 cache 512 KBytes, 16-way set associative, 64-byte line size
FID/VID Control yes
Max FID 9.0x
Max VID 1.200 V

K8 Thermal sensor yes
K8 Revision ID 5.2
Attached device PCI device at bus 0, device 24, function 0
Attached device PCI device at bus 0, device 24, function 1
Attached device PCI device at bus 0, device 24, function 2
Attached device PCI device at bus 0, device 24, function 3


I've downloaded the Ideneb 10.5.5 image and tried booting with it and get the following error

IOPCCardBridge ::Start Failed
Extension "com.apple.driver.AppleOnboardPCATA" has no explicit
AppleFIAATADriver : VIA 8237 SATA (CMD 8x8448, CTR 8x8434, IRQ RTL8139:: FixEnetFlowControl - flow control is disabled
Still waiting for root device

It justs repeats the still waiting for root device. I even tried starting with in safe mode and no luck

Could someone assist me with this?