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Trouble shooting on board video.

Discussion in 'Hardware' started by BigTex, Dec 28, 2003.

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  1. BigTex

    BigTex Thread Starter

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    How do you trouble shoot an on board video card? It's an HP 7840. One thing that I notice is that the computer (a friends by the way) has only one fan (front side).

    He said he's had it just a little over a year, he said that it was freezing up at times so he went and so he bought more memory (it only had 64 to begin with), but when he turned it off and added the memory it wouldn't come on, it's just a blank screen. I'm thinking that the MOBO is fried!

    Any comments or suggestions are welcome.

    Thanks!
     
  2. NitroNic

    NitroNic

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    What happens if you take that added memory back out and try to turn it on?
     
  3. BigTex

    BigTex Thread Starter

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    It does the same thing.
     
  4. NitroNic

    NitroNic

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    So it worked, or would at least turn on.

    You added memory, wouldn't turn on.

    You subracted the added memory, still wouldn't turn on.

    Correct?

    Are there any beep codes?
     
  5. BigTex

    BigTex Thread Starter

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    Yes, that's correct, no beep codes at all and the power supply is just fine.
     
  6. NitroNic

    NitroNic

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    I didn't look up to see that particular type of computer, but I"m assuming (yeah, I know what happens when we assume.....) that it's an ATX. Did you unplug it before putting the memory in? Also make sure you didn't knock anything else loose.
     
  7. BigTex

    BigTex Thread Starter

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    Yes I unplugged it and doubled checked all the cables and everything seems to be fine.
     
  8. NitroNic

    NitroNic

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    Well, I suppose it's possible that that RAM is bad, and could have dammaged your mobo... Is the power switch working?

    If you have other processors that work with that board, you could start switching componets out untill something works (if it does). LIke try that memory and processor in another MOBO if you have the right type.


    ANYONE ELSE WANT TO HELP ME HERE?:)


    Nic
     
  9. BigTex

    BigTex Thread Starter

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    The front side power switch does nothing and the monitor doesn't recognize the MOBO, the lights on the MOBO stays organe and it keeps blinking as if it's not connected to the MOBO.
     
  10. NitroNic

    NitroNic

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    Are there any lights on the motherboard it's self that are lighted?

    And if the switch is bad, try shorting with a paperclip or something the pins that it is supposed to short. OR check the continuity of the switch with a volt meter.
     
  11. BigTex

    BigTex Thread Starter

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    Hey NitroNic, no I didn't see any lights on what so ever.
     
  12. NitroNic

    NitroNic

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    Correct me if I'm wrong, but ATX boards have a light in them, indicating that they are powered (some have a light in them to indicate that they're in standby mode and such). If the power cable is connected, and the power supply is powered (please tell me it's plugged in....lol), then that light inside should be on.

    Just to be safe, you might try another power supply too. Or, if you're not afraid to open it up, check to see if a fuse is blown in it.
    Also make sure the switch on the back of the power supply is on ( the "I" mark, not the "O").

    If everything there looks okay, and the light is still not on, then the poor thing might be toast.

    one more thing to check:

    If you have a map of the motherboard, or if you see any place on it marked "Power LED" or anything like that, that LOOKS like an LED is there..... make sure there is an LED that would be lighted when the mobo is powered.


    Nic
     
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