Cant upgrade to ati 4670

I have a compaq computer with 6150se intergrated graphic card. I bought a new graphic card for it but after I finish installing, the screen doesn't turn on. I think there may be a problem with my power supply because the recommended is 400w and I only have 250w. PLz help me out
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More about cant upgrade 4670
  1. buy a new power supply.
  2. Did you disable integrate graphics in the BIOS?
  3. actually that will probably do it, but I dont know about your power supply.
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