btw, i just saw ur advanced bios feature option there.
under 'init display first', u shud set to [PEG] not [PCI]. dis one makes u boot from ur PCI-E card first.

actually, i hv nearly the same mobo as urs, same proc (but different VID). but then, my OC not as painful as urs.
ask u smtg. did u mount ur heatsink properly??normally,334X 9 sure can boot a Q6600 without even up a single notch of Vcore by default.

ok la.try another way.if u fail again, u reset ur bios.
Disable CPU Enchance Halt ( in Advanced Bios Feature)
Disable CPU EIST (in Advanced Bios Feature)
Disable CIA2 ( in MIT)
Enable CPU Host Clock Control (in MIT)
CPU Host Frequency set to [334]
PCI Express Frequency set to [100]
Performance Enchance [Standard] <--if u get ur system stable only mess wif dis. got something to do wif ur performance
System Memory Multiplier [2.0] or [2.4] or [2.5] <<<- any setting which is below and closest to 1000 Mhz of ur RAM specifications
System Voltage set to [Manual]
DDR2 Overvoltage [+0.2]


u try dis setting see can or not. things tht i din mention, dun touch pls.

actually if cannot OC, the manufacturer will accept RMA or not? its not tht it cannot start at all. just cannot OC.

flash BIOS actually not tht scary. read the motherboard manual.it has steps to do it.

maybe is coz he's running 4 sticks of RAM. too much stress on the NB till it cripple the OC performance.