Flashing new rom

[barker71]

Ok so I'm having issues with trying to flash a new rom using rom manager.
Rooted my phone using gingerbreak and superuser.
Downloaded rom manager
Flashed clockwork mod recovery
Download cyan7 from the list in rom manager .
Here's where it goes bad.
After a successful download of the new rom. When it boots back up I get the white triangle with the phone lying by it. Doesn't do anything after that. So I pushed the power button three times and it boots back up in stock mod just fine.
What am I missing? I'd really like to try a different rom but the white triangle comes up every time.
Would really appreciate some advice here
Thanks

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