i jump a car off with my car now mine won't start. on 2004 Mercedes-Benz C320

A friend said it may be the relay took it to a shop they said the computer was fried radio comes on key turns everything comes up on the dash board so how can the computer be fried.

Well Mr. nice guy, that's what you get for doing somebody a favor! Other car crank ok?? If so, it wasn't a total loss! Both y'all from Potwin, i bet!
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It's what you don't know that hurts, haven't you ever heard not to do that because you can mess something up, Power Surge.