POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the
undersigned constitutes and appoints each of Christopher H. Gebhardt and
Michael McAndrew as the undersigned's true and lawful attorney-in-fact to:
(i) execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer and/or director of Black Box Corporation (the
"Company"), Forms 3, 4 and 5 (or such similar or successor forms as may be
adopted) in accordance with Section 16(a) of the Securities Exchange Act of
1934, as amended (the "Exchange Act") and the rules promulgated thereunder;
(ii) do and perform any and all acts for and on behalf of the undersigned
which may be necessary or desirable to complete and execute any such Form
3, 4 or 5 (or such similar or successor forms as may be adopted) and timely
file such form with the United States Securities and Exchange Commission,
any stock exchange or similar authority; and (iii) take any other action of
any type whatsoever in connection with the foregoing which, in the opinion
of such attorney-in-fact, may be of benefit to, in the best interest of or
legally required by, the undersigned, it being understood that the
documents executed by such attorney-in-fact on behalf of the undersigned
pursuant to this Power of Attorney shall be in such form and shall contain
such terms and conditions as such attorney-in-fact may approve in such
attorney-in-fact's sole discretion.

The undersigned hereby grants to
each such attorney-in-fact full power and authority to do and perform any
and every act and thing whatsoever requisite, necessary or proper to be
done in the exercise of any of the rights and powers herein granted, as
fully to all intents and purposes as the undersigned might or could do if
personally present, with full power of substitution or revocation, hereby
ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to
be done by virtue of this Power of Attorney and the rights and powers
herein granted.  The undersigned acknowledges that each of the foregoing
attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Exchange
Act.

This Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3, 4 and 5 (or
such similar or successor forms as may be adopted) with respect to the
undersigned's holdings of and transactions in securities issued by the
Company, unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the
undersigned has caused this Power of Attorney to be executed as of this
11th day of November, 2004.

Signature: /s/ Francis W. Wertheimber

Name:  Francis W. Wertheimber