Hi Help_needed62,
Here are the steps to remove the power supply for Inspiron 580:
Note: During installation or removal of any hardware, always turn off the system and ensure all data is backed up properly. Disconnect any telephone, network, and USB cables from the computer. Disconnect the computer and all attached devices from their electrical outlets.
- Locate the power supply in the system chassis
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- Disconnect the DC power cables from the system board and drives
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- Unroute the cables from the chassis hooks
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- Remove the four screws securing the power supply to the chassis
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- While lifting up on the front of the power supply with one hand, push down the release tabs located at the base of the power supply with your other hand. Disengage the power supply from the chassis
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- Once released, slide the power supply forward
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- Remove the power supply and its cables from the cables
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- Now, you should be able to remove the power supply
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You may also refer to the service manual. Here is the link http://bit.ly/VphDmP
Hope this helps.