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Optiplex 780 won't boot with Nvidia NVS 300


I recently purchased two Nvidia NVS 300 pci-e x 16 graphic cards for two Optiplex 780's SFF (Small Form Factor).

Both computers won't boot with new cards installed, the fans are running at 100% all the time after power on and there is no display at monitor screen (it goes to sleep mode). I'm using DMS-59 to vga and dvi adapter. Problem exists with both vga and dvi connection (Dell monitor).

I installed new bios and chipset drivers. System works fine with on-board graphic card. Windows 7 64bit.

Any ideas?

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