<PAGE>

                                  EXHIBIT 24

                              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, 2000, 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
27, 2001.



/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, 2000, 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
27, 2001.



/s/ C. Robert Hahn                             Vice President/COO/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, 2000, 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
27, 2001.



/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, 2000, 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
27, 2001.



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


Thomas M. O'Leary
--------------------------------
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, 2000, 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
27, 2001.



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


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