Thanks for the replies. I think I understand a little better now what DSDT is all about.

Since I didn't require a dsdt file when installing Leopard I am going to try and install
Snow Leopard without it again. If it works, great! If not I will plunge into DSDT.

Again, Thanks

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ASUS P5Q3 Deluxe WIFI@N
Intel core 2 E8500
8gb Gskill dddr3 memory
EVGA 9800GT Graphics card
2 SATA II 500gb hard drives
1 Samsung SATA DVD drives
Mac OS X 10.6.1, Win Vista 64bit, Win 7 64 bit RC
Ubuntu Linux