Question about Compaq Presario 1200XL104 Notebook

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Boot up problem

I have an old Compaq prosignia 150 running windows 98. The dc power jack broke and i disassembled the laptop and replaced the faulty jack with a new one.On re assembly i plugged in the dc power jack,the green led comes on to indicate power is coming through but when i press the on button nothing happens,not even a sound of the hdd spinning, any suggestions as to what is wrong.

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  • paul bissett Jul 25, 2007

    no the fan doesn't come on,the only sign of life is the green led on the front which makes me think that the power jack is in correctly.there is a small battery for the cmos I'll try removing this to clear the cmos and see what happens, thanks



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Could you hear the sound of the Fan insidle? I think there should be a fan inside of this kind of old laptop. Please have a check. If the fan is OK. I think you should there should be something wrong with the mother board inside. You could try cleaning your CMOS by some way and try again. Of course. the first thing you gonna do is checking whethere all the connections of your new power jack is ok. Jimmie

Posted on Jul 24, 2007

  • Jimmie Zhou Jul 25, 2007

    The green led only shows the power is added on to your mother board. But the mother board have to trigger something (like the crystal 37.825Hz) to make the system on. Check the coms first then have another try. Or, I think your mother board should have some problem.


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Possible that a static discharge occurred during your solder work taking out sensitive board parts...was your grounding wrist strap on and were you properly grounded?

Posted on Jul 22, 2007


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This is an example of a DC Power jack for a Toshiba Satellite a215-s5807,

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That laptop DC Power Jack has metal prongs, that come out of the plastic body. One prong, (Or pin), connects to the Positive metal round pin, in the center of the jack.
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B.If the entire jack moves, you have cracked solder joints. (Broken)

Replacement of the DC Power Jack for A.
Re-solder the solder joint/s for B.

Cost of replacing a jack at a reputable computer repair shop? $90 to $150
Cost of re-soldering solder joints? $50 to $90
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$250 on up.

If you are a skilled person with the correct tools, it is feasible for you to replace the jack, or re-solder the solder joints.
It is also feasible that you yourself, could replace the motherboard.

Some laptops have a poor motherboard design, for where the DC Power Jack is mounted to the motherboard.

Crude explanation would be, that the main body of the motherboard is a 1 foot square. Then a 2 inch square comes out of the side of the main body.
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(Don't forget to buy, and use a cheap ESD wrist strap, to prevent static shock to the delicate hardware components, inside your laptop. Average cost is $7)

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