Replacing power supply in dell pc

I recently purchased a higher wattage psu so that I could run a video card on a new computer. When I installed it and turned the pc on, all I get is a solid amber light on the front, no fans start or anything. When I reinstall the old one everything is fine. O exchanged the new PSU thinking it was bad but I got the same results, any ideas?
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  1. It would help if you'd be more specific on the old and new PSU. Please give us the brand and model.
  2. The new psu is a dynex 520 watt atx, the old psu was what came standard on a dell inspiron 560, I think the wattage is 250, definately under 300
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