Desktop won't power on/Green light will light up a little/fan spins a little?

Trying to help a friend, with an HP computer. Forgot to get the model number. It won't start up, I can momentarily get the green light on the power supply to go on, and the fan runs momentarily. It won't start up.
Would you think it was the power supply or the motherboard? Any Suggestions.
Thanks Bruce

Hello brucefl,
I have read your post on how your friend's computer will not power on, and I would be happy to assist you in this matter!
Since the fan spins a little bit with the green light, I recommend following this document on Computer Does Not Start (Windows 7) or for (Windows 8). This resource should help power on your desktop, or specify if there is a hardware defect attributing to the issue.
For further assistance, I will need to know:
The Product and Model Number of your desktop computer.
The version of Windows you have installed on your computer.
If this is an on-going, or recent issue.
If you have added any new hardware or software recently to your computer.
Please re-post with the results of your troubleshooting, as well as the requested information above. I look forward to your reply!
Regards
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

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I understand that after replacing your power supply your computer will no longer boot up. To assist you with this I am providing you with an HP Support document: Replacing the Power Supply in HP and Compaq Desktop PCs, which will walk you through the replacement process. I suggest you review the document and ensure that everything is connected the way it is supposed to be. I am also providing you with an HP Support document: Troubleshooting Power Supply Issues, which you can use to troubleshoot your power supply if you have follow the first document and still have the same issue.
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Desktop won't power on/Green light will light up a little/fan spins a little?

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