No display, new video card


I have an Asus P5Q Se Plus with a recently broken video card GF 8600GT DDR. I replaced it with the xfx radeon hd 5450 2gb dd3 and now nothing displays on my screens and I keep double booting. Is the dd3 creating a problem since I run ddr2? Maybe it is my old mobo, it says it runs pci 2.0, but the xfx card is pci 2.1.

Thank you for the help in advance and if anyone can recommend a better video card, please do. I haven't build in 5 years now

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  1. edit: my power supply, total output wattage 450. Raidmax
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