Well guys, i figured it out. I'm using 2 western digital mybook external harddisks. In the bios there is a setting "legacy USB Boot Device" which was enabled.
By disabling this it posted through the boot and is overclocking like sunshine....
I'm a noob in overclocking. I have build my first rig with the following components:
P35c-Ds3r rev 2.0
Q6600
OCZ2N1066SR2GK (2gb total 2*1)
Zalman 9700 led
Zalman HP600
MSI 8800GTS 512mb OC version
Antec Nine hundred
Bios F4
Creative Xi-Fi Music
My bios is set up like this...