Question about HP Pavilion Elite M9400F PC Desktop

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I can't seem toget my HP pavilion m9400f elite to come on. The power supply light in the back lites up but the PC will not start :( Please help.

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  • Rod Pexxon Jan 13, 2013

    By the way if it is just the PSU, do I have to get one with same wattage rating or can I get one rated higher? Also I've seen in other posts that the mother board for my PC has been DCed. How hard a fix is that?

  • Justin
    Justin Jan 13, 2013

    You can put as high a wattage PSU as you want. Generally 200-250 watts is fine for an low end system. 350-400 Watts if you are adding a video card.

  • Justin
    Justin Jan 13, 2013

    Because a power supply, supplies several different voltages to different components, when the power supply starts to fail, the most common problem yo'll experience is a partial power up. Generally you will have either some lights, some fans going or both.



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I can't say that this will help you but at least you are trying something.Disconnect the power cord from the unit wait 10 seconds and then plug back in. Check and make sure that you are on the right power setting for your computer by looking at the red tab on the back and make sure it is on the right setting ,this is your voltage selector switch.If none of this works make sure that you have power coming from the wall or outlet that you are plugged into If all of this fails you may have to have a new power supple box for your comp. Also check all of your power supply cords, I have seen them give a power problem before. I hope that this will help you,if not give me some more info on what all you did and what your system is still doing... Good Luck..

Posted on Jan 13, 2013

  • Rod Pexxon Jan 13, 2013

    I have disconnected and reconnected all PS cables, done a paper clip jump with the green PS wire to all available black PS wires to see if PSU fan is receiving signal from motherboard (fan works fine) don't know what to do at this point. after I did the wire jump I waited a while and strangely it came on but I had it pluged in wrong spot so I attempted to move it and hook everything up, but now it wont work again. :(

  • George Giles Jan 14, 2013

    You said that you had it pluged in the wrong spot? If you are talking about thw wal or a certain outlet ,it could be that the outlet has gone bad and you don't have a comp problem at all.Also you may have a short in one of your cords,I would plug it back up in the slot where it worked and see if it takes off running again,if this doesn't work check your cords with an ohm meter if you have one. If all of this doesn't work I would look at a new power supply for your comp.,One more thing check out HP website to see if anyone else has had a problem simular to this.. Good Luck Again ,and I will try to keep up with your committs...


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  • 2,072 Answers

This will generally be caused by one of two things.

  • Bad power supply
  • Bad motherboard

Start by repalcing the power supply, that is usually the problem.

Posted on Jan 13, 2013


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SOURCE: HP a350n not powering up.

unplug power and open computer and pull the small battery and wait 30 sec and replace
plug in everything and reboot
may have to re-enter cmos utility

Posted on Aug 25, 2008

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SOURCE: HP computer doesn't turn on

Your power supply is bad--you will need to replace. I suggest looking at tigerdiect for a replacement.

Posted on Dec 12, 2008

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SOURCE: Hp pc m7640n won't turn on and power supply light is out

OK, this can be a hard thing to fix. Most of the time, the power supply is the first thing to go on a PC. However, when you stated that the motherboards LED came on after you unpluged the PS from the motherboard, it leads me to believe that the motherboard is the issue but the power supply might be outputting higher voltages and the motherboard might be shutting down. Since the power supply is cheaper then most motherboards, I would recommend getting a new one. Check ebay for a new power supply. It should be about $20 with shipping. If the same thing happens, then you need a new motherboard...

Posted on May 30, 2009

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SOURCE: Hp Pavilion a1120n will not power up.

Yes it needs a power supply. You can get a cheep one on eaby or get one off of the HP site

Hope this works,

Luke Wilcox

Posted on Dec 29, 2009

  • 3 Answers

SOURCE: HP Pavilion M9040N Elite, power lights come on, will not boot

Boatin4me is correct on the process of elimination. I had the same issue and it was related to a bad modem.

Posted on Jan 11, 2010

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