where's my mac os?!

[tonig2593]

ok so I installed the mac os x again via ipc 10.5.6 and it was a successful install, then it restarted, I've let it do everything by it self... instead it just went to windows.... it had previously the boot0: error and Icouldn't even get to windows... but now it just boots to windows as if the mac partition doesn't even exist... can this be caused by a wrong choice at the customization menu if yes can you please tell me what to choose I tried the installation too many times now :S these are my specs:

 

CPU: Intel core 2 quad Q6600 2.4GHz

RAM: 4GB DDR2

HDD: SATAII 320GB

Video card: Nvidia GEforce 9600GT 1GB

PS2 keyboard, USB mouse

motherboard: ASRock 4core1333-FullHD

MB specs:

LGA 775 for Intel® Core™ 2 Extreme / Core™ 2 Quad / Core™ 2 Duo / Pentium® Dual Core / Celeron®, supporting Quad Core Yorkfield and Dual Core Wolfdale processors

ATI™ RS600 + SB600 Chipsets

Compatible with all FSB1333/1066/800/533MHz CPUs

Supports Dual Channel DDR2 800/667/533 with 4 DIMM slots, maximum capacity up to 8GB

Integrated ATI™ X1250 graphics, supports H/W T&L, DirectX 9.0, Max. shared memory 512MB

1 x PCI Express x16 slot

Untied Overclocking : During Overclocking, FSB enjoys better margin due to fixed PCIE/ PCI Buses

Hybrid Booster - Safe Overclocking Technology

Dual VGA Output: Support DVI-D and D-Sub ports by independent display controllers

Supports HDCP function with DVI-D port, to enjoy better quality with High Definition HDCP Encryption contents

Supports Full HD 1080p Blu-ray (BD) / HD-DVD playback with DVI-D port

Supports PCIE Gigabit LAN 10/100/1000 Mb/s

Supports 2 x IEEE 1394 Ports (one port on back panel, one header on board)

4 x SATAII 3.0 Gb/s, support RAID (RAID 0, RAID 1, RAID 0+1, JBOD and RAID 10), NCQ, AHCI and "Hot Plug" functions

Chipset embedded HDMI Audio which supports HDMI signal through DVI-D port by using DVI to HDMI adapter (not bundled)

7.1 CH Windows® Vista™ Premium Level HD Audio (ALC888 Audio Codec)

Windows® Vista™ Premium 2007 Logo Ready

ASRock DVI_1394 I/O: 1 x VGA/DVI-D Port, 1 x VGA/D-Sub Port, 1 x IEEE 1394 Port

 

any help is really appreciated, thanks in advance