I updated successfully taking caution to remove the sleep enabler kext (that didn't work anyway) and everything still works fine and dandy except for my GMA X4500 graphics crad that used to work on 10.6.2.

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• Toshiba l455 series
• 4gbs of RAM
• Intel GMA X4500m graphics card
• pentium dual core processor 2.20 ghz
• 320 gb hard drive
• Realtek RTL8102E/RTL8103E Family PCI-E Fast Ethernet NIC (NDIS 6.20)
• Realtek RTL8187B Wireless 802.11b/g 54Mbps USB 2.0 Network Adapter

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snowosx universal 10.6.4- Everything working except quartzgl and quartz extreme