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HELP! Desktop turns on and restarts repeatedly, other turns on to black screen

Discussion in 'Hardware' started by cvocvo, Dec 30, 2007.

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  1. cvocvo

    cvocvo Thread Starter

    Joined:
    Dec 30, 2007
    Messages:
    1
    Hi,
    I'm having trouble with two of my desktops.
    Desktop #1 Problem:
    When all cords and such are plugged in, I press the power button. The desktop turns on for about 1-2 seconds and then restarts. The bios doesn't flash, the os doesn't boot. As far as I can tell the desktop restarts indefinitely. Any ideas what's going on here?
    --Desktop Type: HP Pavilion a705W
    I found someone with a similar problem here

    Desktop #2 Problem:
    I bought some 3M Dust Remover a few days ago. I disconnected power, along with everything else, from a desktop of mine. Pulled the cover off and started blowing the dust out of the case. I put everything back together, plugged it in, and the desktop doesn't work. It boots to a blank screen with the the power and hard drive led's stuck on, on the front of the desktop. The led on the back of the power supply turns on, I can hear the hard drive spin up, it detects the cd/dvd drives, floppy drive and then just hangs with the led's stuck on. Anyone have an idea what might be going on here?
    --Desktop Type: Compaq Presario S4200NX

    Thanks for the help, I'm hoping to get atleast one of these back online w/o buying a whole new desktop.
    -Chris
     
  2. pinntech

    pinntech

    Joined:
    Aug 25, 2004
    Messages:
    893
    Hi….

    Desktop 1:

    Do you see anything on your screen at all while this is happening?

    Have you tried to press the setup key to see if the BIOS will come up and make changes?

    Do you have any USB devices (other than keyboard or mouse) hooked up? If so, try disconnecting them and see if it will at least POST or attempt to go into the OS.

    WARNING: Before checking the capacitors, disconnect the power cord on your system and press & hold the POWER button to allow the power to discharge! Also, you should always ground yourself before touching computer components to prevent static discharge!

    Just FYI, some of the motherboards in this series of HP’s have issues with the capacitors.

    You should take a look at the capacitors to see if the tops of them are raised or discolored. Also, if you put your finger on the top of the capacitors, they should feel as if they are INDENTED and not flush or raised. Raising or discoloration (up to and including a black tar looking substance on the tops indicate a leaking capacitor).

    Desktop 2:

    Any POST sounds (beeps) produced at all?

    Have you tried the monitor from Desktop 1 on this one?

    Anything at all displayed on the monitor, to include CHECK CABLE message?

    Recommendation: Open the case again and ensure that all the cards, memory, drive cables and so forth are all connect properly and not loose or dislodged.

    Do you know how to RESET your BIOS to default using the onboard jumpers?

    Here is a detailed link on troubleshooting this issue:

    http://h10025.www1.hp.com/ewfrf/wc/...cc=us&dlc=en&product=338684&rule=4566&lang=en

    Thanks and keep us up-to-date!

    Shane

    Found another good link:
    http://h10025.www1.hp.com/ewfrf/wc/...788&lc=en&cc=us&dlc=en&product=338684&lang=en
     
  3. Chris A

    Chris A

    Joined:
    May 9, 2000
    Messages:
    3,212
    Wow. That is a mess.
    I would take both of these computers down to the bare esentials. Video card and memory. Reseat the memory in both of them. Video is integrated on both of them. Make sure the CPU fans are spining.

    First one sounds like bad memory or motherboard.

    Sorry not much help...
     
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