Possible problems with Samsung Galaxy S2 - Galaxy S II Q&A, Help & Troubleshooting

I recently picked up a Samsung Galaxy S2, and after having much success jailbreaking phones, I tried to root my android. I succesfully got a rooted kernel and all that was fine, but then when I tried to install a custom ROM (cyanogenmod 7.1) I had a couple errors and now when I go to power on my device it just shows the Samsung logo, with the yellow triangle, and then powers off. Is my device bricked? And if so is there a simple solution.
All help is appreciated,
Sting Rray

First try this CM7 should be flashed twice from recovery!! Flash once n then reboot into recovery n flash again. You're good to go!

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