IPhone 3G jailbreaking problems?

(Using Greenpois0n) Well I have iOS 4.2.1 and can't upgrade further. I've jailbroken before, but when I do it with my phone, it shuts off during the "Hold power and home" step. The step takes 10 seconds but the phone shuts off after 4 seconds then the timers run out. Any way to fix this?

Keep holding for 10 seconds, even if it turns off.

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