WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

  

<ARTICLE> 5
<RESTATED><F1>
<MULTIPLIER> 1,000

                                                                                            
<PERIOD-TYPE>                   YEAR                     YEAR                    YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1995             DEC-31-1996             DEC-31-1997             DEC-31-1998
<PERIOD-START>                             JAN-01-1995             JAN-01-1996             JAN-01-1997             JAN-01-1998
<PERIOD-END>                               DEC-31-1995             DEC-31-1996             DEC-31-1997             DEC-31-1998
<CASH>                                          15,243                  12,455                  12,376                  12,875
<SECURITIES>                                         0                       0                  20,175                  15,839
<RECEIVABLES>                                   21,934                  22,115                  40,576                  17,055
<ALLOWANCES>                                     (316)                   (382)                   (587)                   (622)
<INVENTORY>                                     21,173                  18,832                  33,833                  23,528
<CURRENT-ASSETS>                                60,578                  56,249                 110,849                  77,745
<PP&E>                                          13,110                  20,394                  25,764                  30,980
<DEPRECIATION>                                 (4,886)                 (7,769)                 (9,981)                (14,778)
<TOTAL-ASSETS>                                  71,888                  72,517                 136,545                 107,736
<CURRENT-LIABILITIES>                           19,133                  12,884                  33,661                  14,520
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                            26                      26                      27                      29
<OTHER-SE>                                      49,841                  56,469                  99,942                  92,134
<TOTAL-LIABILITY-AND-EQUITY>                    71,888                  72,517                 136,545                 107,736
<SALES>                                        130,184                 138,074                 188,339                 134,019
<TOTAL-REVENUES>                               130,184                 138,074                 188,339                 134,019
<CGS>                                           69,241                  88,368                 116,683                  94,000
<TOTAL-COSTS>                                   69,241                  88,368                 116,683                  94,000
<OTHER-EXPENSES>                                34,050                  39,448                  49,889                  54,767
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                                 690                     340                     553                     340
<INCOME-PRETAX>                                 26,451                  10,183                  20,893                (14,547)
<INCOME-TAX>                                    10,110                   4,055                   7,962                 (3,522)
<INCOME-CONTINUING>                             16,341                   6,128                  12,931                (11,025)
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                    16,341                   6,128                  12,931                (11,025)
<EPS-BASIC>                                     0.71                    0.24                    0.49                  (0.38)
<EPS-DILUTED>                                     0.68                    0.23                    0.48                  (0.38)
<FN>
<F1> RESTATED PER POOLING MERGER OF ADVANCED ENERGY AND SEKIDENKO, INC. IN Q2
     2000
</FN>