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[PC Hardware Question] How to fix this?

[PC Hardware Question] How to fix this?

zhuanyizhuanyi Member
edited September 2012 in General

Trying to help a friend to fix her desktop, the motherboard is Asus P7 H55-M Pro, brand new power supply (as the old one is not working) and case, everything else was working before prior to the failure of the old power supply.

Plugged in everything and powered on and now the power light on the front panel of the tower is turned on for a few seconds and turned off, now the tower refused to turn on no matter how many times I tried to hit on the power button. However once I unplug the PC and plug it back in, I can turn it back on and the power light will be on again.

Do you know what is the likely cause of this and is there any steps that I could take to determine the exact cause?

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  • sounds like maybe more than just the powersupply, there may have a powersurge that killed the power managment on the board. How many watts is the new power supply?

  • how many watts was the old power supply.

  • I'm not finding this motherboard model. Is there a battery on the board?

  • the new PSU might not have enough wat to power up the PC, how much watt is the PSU?

    Thanked by 2netomx SimpleNode
  • AsadHaiderAsadHaider Member
    edited September 2012

    @gbshouse said: any specific beeps

    I never bother with the motherboard speaker, my mobo has a LCD Poster which is extremely helpful.

  • @Randy that was my thoughts, but without knowing specs, my guess is not enough watts or power managment on the board is toast

  • @AsadHaider - sometimes it helps, for example when RAM is placed not accurate

  • I guess @AsadHaider just throwns them out and buys a new one when something goes wrong.

  • AsadHaiderAsadHaider Member
    edited September 2012

    @gbshouse @24khost I accidentally hit post. Haha naw, I have a lcd poster hooked up to mine so it prints out what the exact error is. I hate those beeps..

  • @24khost said: @Randy that was my thoughts, but without knowing specs, my guess is not enough watts or power managment on the board is toast

    yeah, that is what i am guessing too but, i would get 500watt, just to be on the safe side

  • @24khost said: sounds like maybe more than just the powersupply, there may have a powersurge that killed the power managment on the board. How many watts is the new power supply?

    Old one is 300W (or 350W) and new one is 600W

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  • @gbshouse said: any specific beeps (http://www.computerhope.com/beep.htm)?

    Nope, no beep at all, which was the unfortunate part...

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  • hmm, it should be more than enough, did you ground yourself first?

  • @jarland said: I'm not finding this motherboard model. Is there a battery on the board?

    http://www.asus.com/Motherboards/Intel_Socket_1156/P7H55M_PRO/

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  • move the read switch on the back to the other side then try it. Works sometimes. Umm otherwise sounds like the motherboard power managment may be smoked. If that doesn't work reseat all cards and ram, and restart computer, see if you can get into the bios.

  • @Randy said: hmm, it should be more than enough, did you ground yourself first?

    ground myself?

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  • @24khost said: If that doesn't work reseat all cards and ram, and restart computer, see if you can get into the bios.

    I think I will just try to start the machine without any thing but CPU and RAM and see if I have any luck there...

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  • human static electricity breaks components of the computer.

    try swapping the PSU to another computer and have a go?

  • yeah when replacing anything you should be grounded. replaceing the powersupply should need to much grounding but touching anything else in the computer, should leave the computer plugged in and your hand on the case at least to groud your self. at minimum if you dont have a wrist strap.

    Thanked by 1Randy
  • Just humor me and flip the red switch on the back of the psu

    Thanked by 1netomx
  • @24khost said: Just humor me and flip the red switch on the back of the psu

    The voltage switch? LOL

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  • RandyRandy Disabled
    edited September 2012

    No way, it will break the PSU and send sparks. LOL do at your own risk .. lol he might be right tho, a flip might work

  • so i guess all i can do for now is to reset mother board by taking out the board battery and unplug everything that is not needed and hopefully something will work?

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  • Sounds like the motherboard was toasted.

  • RandyRandy Disabled
    edited September 2012

    i would test the PSU first on another computer

  • @Randy said: i would test the PSU first on another computer

    unfortunately that is the only desktop we have there...

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  • I have had it happen before where you flip the voltage, and boom it starts working or switch it turn it on, it resets something turn it off, switch the voltage back and it works it really can just be some wierd things. I have seen where a modem card will kill the computer totally not beep codes.

  • @gbshouse this doesn't check that it is sending the right voltage though.

  • @24khost said: this doesn't check that it is sending the right voltage though.

    PSU might be fried, as he didn't ground himself

  • my guess is more the board than the power supply. if he gets any spin out of the cpu fan than it is most likley the pm on the board.

    Thanked by 1Randy
  • hardware speaking pretty hard to fry a psu from not being grounded. not as delicate as memory and such.

    Thanked by 1Randy
  • check out the RAM Memory, had that problem at school and i have put in new RAM sticks (Was a part of learning)

  • In terms of damaging equipment through ESD (Electrical Static Discharge) from ourselves; unless the machine is before 2001, most compoments come with much higher ESD protection, touch wood, i've never had anything die out on me through this way, i've had CPU coolers be stuck like bonding resin through improper use of thermal paste, I've also had bread in a CD Drive, but I've never heard (recently) that ESD has broken anything.

    As for this problem, your options are limited, unfortunately.

    Get a multimeter, see if the PSU is working, do the hotwire test, remove/replace mb battery.

    With no beeps for POST, I'd assume there's something PRE-BIOS happening, so indications move to PSU and MOBO, I highly doubt its a RAM/HDD/GPU/WHATEVER problem, since you'd have some form of post and beeps.

    Good luck, let us know how you fix it!

  • @Randy said: PSU might be fried, as he didn't ground himself

    I have NEVER ground myself in my 20 years of using computers and electronic boards, and NO card has been damaged ever since :P

  • RandyRandy Disabled
    edited September 2012

    @netomx said: I have NEVER ground myself in my 20 years of using computers and electronic boards, and NO card has been damaged ever since :P

    Consider yourself lucky=)

  • @Randy said: Consider yourself lucky=)

    I am ;)

    Thanked by 1Randy
  • sleddogsleddog Member
    edited September 2012

    @zhuanyi said: brand new power supply (as the old one is not working) and case

    1. How did you determine that the old power supply was not working? By testing with a meter? If not, the root problem may not be the power supply at all...

    2. You replaced the case? If so, have you double-checked to ensure that the front panel wiring is connected correctly to the motherboard? A power button doesn't do much if it's not connected correctly :)

    Thanked by 1Randy
  • I ordered a Dell Perc 5 thanks to @damian a while ago, I am pretty sure I faulted it through ESD, So I bought two cables and just use them whenever I touch RAM/Controllers.

    I also bought about 32GB RAM a month ago, and had atleast 4 faulty sticks. which was working on dispatch(before I had the cable), ESD Sucks.

    @netomx said: I have NEVER ground myself in my 20 years of using computers and electronic boards, and NO card has been damaged ever since :P

    Thanked by 1Randy
  • @netomx Do you normally leave the computer plugged in and lean on the case with your hand when you take things out of the computer? or put your arm on the case when your inside it? If it is plugged in you are grounded.

  • pcanpcan Member
    edited September 2012

    @zuanhi said: all i can do for now is to reset mother board by taking out the board battery and unplug everything that is not needed

    According to your original description, there could be a short on power supply lines that trips the overcurrent protection circuit on the PSU; or the front panel power switch could have a short-circuit inside. To find the faulty component, you need to remove everything from the mainboard, including all the the RAM sticks; unplug all the cables including the front panel switches. Unplug all the internal peripherals. You should also remove the motherboard from the case, because there could be a loose screw trapped underneath the board. Use the screwdriver to operate the power jumper. Power should stay on and speaker should start to beep. If the fault is still there, check/replace motherboard and CPU. The replacement PSU could also be wrong/faulty.

    Regarding the ESD suggestions: they are essential when the air humidity is too low. Inside a server room with cheap HVAC, for example, humidity is near 0% and huge ESD spikes could be triggered easily. On a regular room and modern hardware, the issue is much lower because most electronic boards must pass a mandatory test that simulates mild ESD spikes. On a previous job, I routinely zapped industrial electronic boards with a ESD simulator (a professional, calibrated spike generator) to check the ESD protection functionality.

  • @Jacob @24khost well my secret is that I always work on a metallic table, and I touch it before starting to work :P

  • @sleddog said: How did you determine that the old power supply was not working? By testing with a meter? If not, the root problem may not be the power supply at all...

    As soon as the computer is plugged into the electrical outlet (even before we pressed the power button), it short-circuited and blew up the fuse...

    You replaced the case? If so, have you double-checked to ensure that the front panel wiring is connected correctly to the motherboard? A power button doesn't do much if it's not connected correctly :)

    Yes, I triple-checked those one pin connector thingy...

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  • Is there a power/reset button on the board itself?

  • @Kairus said: Is there a power/reset button on the board itself?

    don't think so, the case does not have a cold reset button, just power.

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  • Dead motherboard, or twisted firmware, or roasted PSU, one of those three.

    Clear the cmos bios and try for a normal boot, if that fails, well, you know what's dead...

    -- BOFH

  • Don't waste any time, MB is burnt, gone, trashed....sleep now.

  • Like I said originally theory on the board is fried

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