Mine needed a 0.025v increase on the cpu to boot.
Runs stable @3.7 quad with 0.075v increase.
Try increasing cpu voltage up to 1.5v max, try underclocking it (reduce the multiplier).
If it doesn't work try the same things with a triple if you have that option.
If that doesn't work you may have to accept that you got what you paid for a dual core, now clock the hell out of it.