<PAGE>

                               POWER OF ATTORNEY
                         FOR ANNUAL REPORT ON FORM 10-KSB

     The undersigned, a director or officer of Pinnacle Data Systems, Inc.,
an Ohio corporation (the "Company"), hereby constitutes and appoints John D.
Bair, my true and lawful attorney-in-fact and agent, with full power to act, for
me and in my name, place, and stead, in my capacity as director or officer of
the Company, to execute the Company's Form 10-KSB Annual Report Pursuant to
Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Company's
fiscal year ended December 31, 2001, and any and all amendments thereto, and to
file the same, with all exhibits thereto and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorney-in-fact and agent, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as I might or could do in person,
hereby ratifying and confirming all that said attorney-in-fact and agent, may
lawfully do or cause to be done by virtue hereof.

     The undersigned has executed and delivered this Power of Attorney on March
     8, 2002.

/S/ Hugh C.Cathey                                    Director
----------------------------------           ----------------------------------
Signature                                    Position(s) with the Company

Hugh C. Cathey
----------------------------------
Print or Type Name

<PAGE>

                                POWER OF ATTORNEY
                         FOR ANNUAL REPORT ON FORM 10-KSB

     The undersigned, a director or officer of Pinnacle Data Systems, Inc.,
an Ohio corporation (the "Company"), hereby constitutes and appoints John D.
Bair, my true and lawful attorney-in-fact and agent, with full power to act, for
me and in my name, place, and stead, in my capacity as director or officer of
the Company, to execute the Company's Form 10-KSB Annual Report Pursuant to
Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Company's
fiscal year ended December 31, 2001, and any and all amendments thereto, and to
file the same, with all exhibits thereto and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorney-in-fact and agent, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as I might or could do in person,
hereby ratifying and confirming all that said attorney-in-fact and agent, may
lawfully do or cause to be done by virtue hereof.

     The undersigned has executed and delivered this Power of Attorney on March
     8, 2002.

/s/ C.R. Hahn                                Vice President/Director
-------------------------------              -----------------------------------
Signature                                    Position(s) with the Company

C.R.Hahn
-------------------------------
Print or Type Name

<PAGE>

                               POWER OF ATTORNEY
                         FOR ANNUAL REPORT ON FORM 10-KSB

     The undersigned, a director or officer of Pinnacle Data Systems, Inc.,
an Ohio corporation (the "Company"), hereby constitutes and appoints John D.
Bair, my true and lawful attorney-in-fact and agent, with full power to act, for
me and in my name, place, and stead, in my capacity as director or officer of
the Company, to execute the Company's Form 10-KSB Annual Report Pursuant to
Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Company's
fiscal year ended December 31, 2001, and any and all amendments thereto, and to
file the same, with all exhibits thereto and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorney-in-fact and agent, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as I might or could do in person,
hereby ratifying and confirming all that said attorney-in-fact and agent, may
lawfully do or cause to be done by virtue hereof.

     The undersigned has executed and delivered this Power of Attorney on March
     8, 2002.

/s/ Paul H. Lambert                                       Director
------------------------------------               ----------------------------
Signature                                          Position(s) with the Company

Paul H.Lambert
------------------------------------
Print or Type Name

<PAGE>

                               POWER OF ATTORNEY
                        FOR ANNUAL REPORT ON FORM 10-KSB

     The undersigned, a director or officer of Pinnacle Data Systems, Inc.,
an Ohio corporation (the "Company"), hereby constitutes and appoints John D.
Bair, my true and lawful attorney-in-fact and agent, with full power to act, for
me and in my name, place, and stead, in my capacity as director or officer of
the Company, to execute the Company's Form 10-KSB Annual Report Pursuant to
Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Company's
fiscal year ended December 31, 2001, and any and all amendments thereto, and to
file the same, with all exhibits thereto and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorney-in-fact and agent, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as I might or could do in person,
hereby ratifying and confirming all that said attorney-in-fact and agent, may
lawfully do or cause to be done by virtue hereof.

     The undersigned has executed and delivered this Power of Attorney on March
     8, 2002.

/s/ Thomas M. O'Leary                                      Director
-----------------------------------                ----------------------------
Signature                                          Position(s) with the Company

Thomas M.O'Lerry
-----------------------------------
Print or Type Name

<PAGE>

                               POWER OF ATTORNEY
                        FOR ANNUAL REPORT ON FORM 10-KSB

     The undersigned, a director or officer of Pinnacle Data Systems, Inc.,
an Ohio corporation (the "Company"), hereby constitutes and appoints John D.
Bair, my true and lawful attorney-in-fact and agent, with full power to act, for
me and in my name, place, and stead, in my capacity as director or officer of
the Company, to execute the Company's Form 10-KSB Annual Report Pursuant to
Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Company's
fiscal year ended December 31, 2001, and any and all amendments thereto, and to
file the same, with all exhibits thereto and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorney-in-fact and agent, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as I might or could do in person,
hereby ratifying and confirming all that said attorney-in-fact and agent, may
lawfully do or cause to be done by virtue hereof.

     The undersigned has executed and delivered this Power of Attorney on March
     8, 2002.

/s/ Robert V.R Ostrander                                    Director
--------------------------------------              ----------------------------
Signature                                           Position(s) with the Company

Robert V.R.Ostrander
--------------------------------------
Print or Type Name