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computer monitor remains blank when starting

hi my computer has been having issues with not putting any display on the monitor. I have a biostar ati hd 4650 GPU, 500 watt PSU, and my computer number is GM5446E. I had a 300 watt PSU powering my computer with the ati GPU before my 500 watt PSU. And after a couple days after i had my 300 watt PSU in with the GPU the display stopped appearing when i turned on the monitor. I am wondering if my 300 watt PSU failed. Both the GPU and the 500 watt PSU are brand new.

Also i would like to add i had a 350 watt PSU in before the 300 watt PSu, but the 350 watt failed.

The 500 watt PSU is: http://www.newegg.com/Product/Product.aspx?Item=N82E16817154026
and the GPU is:http://www.newegg.com/Product/Product.aspx?Item=N82E16814141113&cm_re=biostar_4650-_-14-141-113-_-Product

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found something

The monitor works fine when plugged into the integrated graphics card but not into the ATI card what do i do? the ATI card is brand new btw

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Try one thing.

While no make, model computer is given which only means my advice will be generic the BIOS SETTING I would look to change is other labeled PRIMARY DISPLAY. Options might be PCI, AGP, PCIe, and so on. Try the other options.

Good luck,
Bob

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