magnethead

does monitor work when directly attached? Sounds like a refresh rate or resolution mismatch.

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For proper support: what are you running? video card, cpu, m/board, ram, power supply, brand, wattage, any error message?
PCI-E requires 26 amps at 12 volts. That's a 650W PSU.
Power Supply Info and Selection . Info on thermal compounds & application . TEST PSU USING MULTI-METER