I would say, try and clean the contacts of the GPU's, Then try swapping the 1st card into the 2nd slot. Vice Versa.
Happened to me once.
Cleaned PCIE and bridge contacts on card with 91% Alcohol and swapped cards around numerous times. No change, other than my patience getting shorter and shorter.
Last edited by OC Maximus; 07-23-2010 at 12:35 PM.
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