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Motherboard - Drive power question

Discussion in 'Hardware' started by ~Candy~, Feb 13, 2003.

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  1. ~Candy~

    ~Candy~ Retired Administrator Thread Starter

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    This might be a silly question....... ;)

    But, upon powering the computer up, if a power supply isn't working correctly, and the cpu fan spins, the case fan spins, the power supply fan spins, the keyboard lights up for just a second, but the cdrom door won't open........could the motherboard or cpu be the culprit, or would that narrow it down to the power supply not putting enough power out?
     
  2. n2gun

    n2gun

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    Candy
    Another possibility is the cd drive. I had one that would not open and ended up replacing it.

    Actually though It would be difficult to eliminate the m/b or power supply. If the cpu was drawing enough power that the cd would not open it seems it would overheat and burn out. You could also check the cpu temperature after a short time and if it is extremely high with sufficient cooling on it then that would be a good clue that the cpu is drawing too much power.

    I think I would try to eliminate another ide device first though by disconnecting what I could from the power supply.
     
  3. ~Candy~

    ~Candy~ Retired Administrator Thread Starter

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    Thanks for the reply Jerry.

    The cdrw was working yesterday as I installed drivers for the USB NIC adapter. I left it on overnight, and this morning, the fans were still running, nothing on the screen, the hard drive still felt warm, cpu was cold. So I rebooted and am still fiddling with it. I have someone who can test the power supply with a multi-meter :)confused: think that's what it is called, not my area of knowledge) to be sure it's not a power supply issue.

    This is the only computer that isn't on backup power, just a cheap power strip that is 'supposed to' have surge protection. Guess I'll start ripping things apart again. I just got it working yesterday for the first time in a month or so......my luck I guess :p
     
  4. n2gun

    n2gun

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    Candy if your going to test the power supply maybe the diagram below will help. It is for an atx supply. If you disconnect from the motherboard and short pins 13 and 14 it will turn it on. (Less chance of damaging something and easier)
     

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  5. ~Candy~

    ~Candy~ Retired Administrator Thread Starter

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    Yes, it's ATX or is it?....now I'm going to show my lack of power supply knowledge :D

    How do I short those? I don't wanna blow anything up this morning :eek:

    Actually, I don't think it is ATX.....I can never keep those straight. This one has two connectors with 6 wires each.......
     
  6. n2gun

    n2gun

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    Just take a small piece of wire and bare about a 1/4 of an inch on each end. Then stick them in the holes for pins 13 and 14. You could even use a paper clip. All this is doing is acting like a switch.

    That acually sounds like an AT power suplly so this won't work.

    Check the link below it will give you the pin out for the at supply.
    You will probably have to check it while attached to the board and running.

    http://www.computerhope.com/help/ps.htm#0112
     
  7. ~Candy~

    ~Candy~ Retired Administrator Thread Starter

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    Hi Jerry, thanks, didn't catch that last edit until I had the power supply tested. I'm being told that it's only putting out 10.7, 10.8 volts (I guess?) and it's supposed to put out 12? ......so I guess that means that I'll be replacing it?
     
  8. n2gun

    n2gun

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    It is definitely outside a 5% tolerance. I would try another one and see.

    Have you tried eliminating some of the hardware? It is possible that something is dragging it down also. Hard drive? things like that. they draw 12v to run the motors and if one is drawing way to much the voltage would drop. Another thought maybe a fan?
     
  9. ~Candy~

    ~Candy~ Retired Administrator Thread Starter

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    Yep, eliminated all of the hardware. Only one small case fan (and the cpu fan) and come to think of it, the small case fan appeared not to be running as fast as I think I remembered it used to be.........

    Will try another one.......think I will just buy a new case and P/S combo since I don't like the floppy drive slot on this one anyway ;)


    Thanks for your input :)
     
  10. n2gun

    n2gun

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    If your getting a new power supply might as well get a pretty case to go with it.;)

    It could be that fan. Just try unplugging it for a few minuites and see what happens.
     
  11. ~Candy~

    ~Candy~ Retired Administrator Thread Starter

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    It's hard wired to a connector on the power supply......don't ask, I didn't do it............I'd have to cut the wire :eek:
     
  12. n2gun

    n2gun

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    Your going to replace it any way. Cut the wires and tape the ends coming from the power supply. If it is running slow it is either not getting enough power or is on its last legs any way.
     
  13. ~Candy~

    ~Candy~ Retired Administrator Thread Starter

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    Ok, I've had one glass of wine too many to be trying to cut wires tonight :D Don't need a new perm that bad........will test that theory in the morning or Monday.......

    Thanks again for all the help!
     
  14. n2gun

    n2gun

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    Have a couple glasses for me while your at it. Too much snow to go anywhere. I am not afraid to drive in it being originally from the snow belt but the other guys bother me when they slip and slide all over.:D :D

    Let me know how you make out when you try it.:)
     
  15. ~Candy~

    ~Candy~ Retired Administrator Thread Starter

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    Ok, clipped the little puppy off.......still no cdrom drive opening. Hooked up a smaller noisy backup power supply (probably soon to die too) and cdrom tray opened.....so diagnosis is bad power supply and Candy is still getting a brand new case :D :D

    Thanks again Jerry!
     
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