Question about HP z540 Digital Entertainment Center PC Desktop

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No power too PC

I have an HP z540 Digital Entertainment Center with standard hardware, that will not start up. The PC was running fine until I removed the cover and replaced it, since then I'm getting a big zero out of it. No response at all when I press the power button. When I removed the cover I sprayed the inside out with an air can, I did not touch or remove anything. I did a proper shut down and unplugged it before I did so. I'm guessing that I loosed a wire inside, but I can't find a wiring diagram for the motherboard. Help and Thanks.

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  • jwhill25 Mar 02, 2009

    I held the can pretty far back so I don't think any liquid came out. I was very careful to stay grounded the entire time. This case and motherboard are pretty non-standard but I don't see any green or other LED lights inside when it's plugged up. One thing I do notice with the case off is a green plastic piece that extends from the CD-RW mounting which seems to make contact with a metal arm from the top case. Near that green piece is an red wire "AWM style 30v etc" that is plugged onto the mother board but un-connected on the other end. It's close enough to the unknown green piece that the metal arm from the case could have unplugged it. The red wire is very short and I have checked for any possible place it could connect with no luck. (Yes, I just noticed the red wire and should have seen it before).

  • jwhill25 Mar 04, 2009

    A power surge here (south pacific) is very possible, but I keep the PC on an surge protector at all times. Prior to my meddling the PC had no problems so I'm inclined to think the problem came from my removing the cover. If anyone knows where I could find a wiring diagram that would be very helpful.

  • Chris Thompson May 11, 2010

    When you sprayed the air did anything liquid come out of the can?....also did you ground your self to the case before you opened it? Does a green LED light come on when plugged up....the green light will be on the mother board.


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That LED light that is not coming shows that your motherboard is not getting any power. Heres the 2 things I would do....

1) Replace your motherboard and if that does not fix it...2) Replace your Power supply.....

Have you recently had any power surges in your area?

Posted on Mar 02, 2009

  • Robert Hale Sep 16, 2013

    Replace the Power Supply first. 19 times out of 20 thats the problem and it is usually cheaper than a motherboard.


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