This is very interesting. Removing everything from the backplane results in only the REG FAIL light coming on. No more +5V FAIL or +2.5 FAIL. Any ideas? -----Original Message----- From: Fred N. van Kempen Sent: Thu 11/7/2002 4:50 PM To: cctalk(a)classiccmp.org Cc: Subject: RE: 875 Power Controller/H7104C 2.5VDC PSU/H7104D 5VDC PSU Yes. Or in the "final" part of the PSI itself. Because it is shorting, the load of the PSU, it's killing the regulators. Or, such is my guess.. --f