[Q] Rooted phone won't restart

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I just rooted my Samsung Galaxy S2 I9100M (Canada's version) following Chainfire noob guide with a fresh Galaxy (nothing changed)

http://forum.xda-developers.com/show....php?t=1103399

I'm pretty sure I followed every step correctly, up to the point the step where I was suppose to wait for the phone to reboot. However, I am stuck on the screen with the Samsung Galaxy S2 GT-I9100 with the yellow triangle but it is not booting. I am sure Odin completed successfully (the green PASS! is there) and I checked Auto-Reboot setting.

It's been stuck on that screen for 30 mins, and I don't know what to do. Help would be appreciated. I looked for similar question but I couldn't find anything that fits my situation.

Which cf-root kernel did you flash though?

I used the CF-Root-SGS2_XX_OXA_KG2-v4.1-CWM4.tar, since mine said I9100MUGKG2

EDIT: I forgot that I could access download mode from a powered-off state. I simply removed the battery, opened it in download mode, and re-flashed it. This time it worked.