If your company engaged in absolutely no activity whatsoever during the past year, then there is little need to hire a CPA for the federal return. You should obviously file your 1120 to establish a paper trail with the IRS, and this can easily be done on paper or via tax filing software. As a general rule of practice, the IRS does not waste resources to audit companies that make no revenue (and therefore don't offer any income to the IRS), unless you give them sufficient reason to believe you're hiding something.
That said, if your company did engage in any activity over the past year, then you should consult a professional about that matter. Same applies to future tax years.
In addition, you should be wary of State tax obligations, which may be more complicated and require professional advice. Some states require a minimum franchise tax/fee for simply having a business entity registered with the state. For example, in California, the minimum franchise tax is $800, even if your company did nothing over the taxable year.
Disclaimer: The above isn't legal/professional advice, just observations from experience.