Phone stuck on HTC symbol when I turn it on after flashing a rom!

[victorias terces]

I am a complete noob so thank you to anyone who wants to help! I rooted my HTC Desire and tried to flash a ROM (not knowing what I was doing) but it didn't work and my phone turned off. When I tried to turn it on it just went to the HTC symbol and does nothing else.

 

[ha5smu]

Have you managed to install a custom recovery such as clockwork mod?

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