Thanks alot guyz i have managed to fix it, i selected iMac 12,1 as mentioned in this forum, all is fine now.
I want to build another Hackintosh and i want to know that if this PC is OK for Mountain Lion, or should I install Lion or Snow Leopard.
System Specs:
Intel Dual Core E6500 (2.93Ghz)
Asus P5QPL-AM (Intel G41 Chipset) (LGA775), Video Chipset: Intel GMA 4500(M)(HD)
Audio: Realtek ALC887
Network Card: Atheros AR8121/AR8113/AR8114 PCI-E Ethernet Controller (NDIS6.20)
1 gb DDR2 Ram (Bus Speed 667 Mhz)
Let me if there is some DSDT available for this Motherboard.
If I need to upgrade RAM then let me know (DDR2 2gb 800 Bus would be fine?). I need to know about SMBIOS shall i select iMac 9,1 it will be fine? or shall i use Mac Pro 3,1?