Thank you for replies
I have more information:
Nvidia GTX 295 is recommended at 680 watt Power Supply and a 700 watt was purchased to be used with the card.
Failure of system would be like tripping of a breaker where it would all shut down the complete PC and require manual switch off and then on of the power switch on the Power Supply.
It seems diagnosed that the system request more power than is possible by the Power Supply. But not in Watts. Instead:
"The existing 700 watt Power Supply did not provide enough Amps on the 12 volt rails to support the GTX 295"
700 watt has 21 Amps on Rail 1 and 22 Amps on Rail 2 but with maximum draw at 38 Amps total.
It is recommended that there be at least 46 Amps available on 12 volt rails, in addition to what is required by the rest of the system for proper operation. 46 Amps dedicated to the GTX 295 that is.
Thank you for helping