Phone won't turn on?

[Terreos]

I was following the Greenpois0n jailbreak guide and I think I F***ed up. I got to step five. However, instead of getting the ready to jailbreak! button in step six I get a Try Again button. I tried it a second time and decided to re-read to make sure I was doing this right. However, I noticed my phone no longer turn on. So. . .did I kill my phone?

 

[GraemeG]

Hold in sleep and home button together for 10seconds. Then once phone back on try JB again

 

[Terreos]

That worked. . .thankyou