i've bricked my tattoo

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so what happend is that i managed to put the black skin on my phone, i was enjoyng my black status bar when i got a phone call and a error was saying something and "force close" ,after that my phone restarted i made a call,i tried to enter messages and again error" force close" restarted,this time after htc logo the screen turns black i can see the phone is turned on but can't do anything.can u help me please?
ps:first of all i must say that i didn't made a nandroid backup because i don't know how

since i wrote first time ,i made some progress.i entered in fstboot,download an official rom and when flashing i got error 131.i think i have to try flashing with the same rom i have now on phone .