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Great Mystery Compaq Presario 1200XL Laptop

Discussion in 'Electronic Repair' started by Brad, Mar 4, 2009.

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  1. Brad

    Brad Guest

    Hi,

    I have a Compaq Presario 1200XL laptop computer that one day,
    would not power up. I tried another power supply, replaced a dead
    RTC/cmos battery, etc. I removed the RTC battery, main battery, and put it
    away. A month later, I decided to try it again. It powered up!
    Everything seemed just fine, but it only lasted for a couple days before it
    happened again. Again, I put it away. A month or so later, it powered
    up and again everything seemed just fine. I downloaded ROM Paq
    SP15611 and I "flashed" the bios. About a day and 1/2 later, the
    laptop "died". Now it won't boot up. Again after a long rest period,
    it came back to "life", but for how long? Note: It won't power up
    after a week's "rest", but it will power up after a longer rest such as a
    month!

    Did anyone have the same experience with this or similar model laptop?

    Thanks in advance, Brad

    Before you type your password, credit card number, etc.,
    be sure there is no active keystroke logger (spyware) in your PC.
     
  2. Ken

    Ken Guest

    By not booting up I assume you mean there is no text of any kind on the
    display? Or do you mean it does not reach the operating system?

    If it were my computer the first thing I would do is clean the contacts
    of the RAM. It sounds a lot like a bad connection and the RAM is
    essential to it booting to even a bios screen for most computers.
     
  3. True, but it's hard to see how that would explain the bizarre behavior
    the O.P. reported (what, do the memory chips magically unseat
    themselves, then reseat themselves in the interval?).


    --
    Made From Pears: Pretty good chance that the product is at least
    mostly pears.
    Made With Pears: Pretty good chance that pears will be detectable in
    the product.
    Contains Pears: One pear seed per multiple tons of product.

    (with apologies to Dorothy L. Sayers)
     
  4. Ken

    Ken Guest

    I assume your question is sincere: Any contact is subject to
    interruption, even those using gold to prevent corrosion. Temperature
    changes often are enough to move such contacts and provide an
    intermittent contact. It really is not magic at all.

    I cannot say definitively that this is his problem, but that is one
    area I would eliminate before suspecting others. It would also be nice
    to have an explanation of exactly what is happening with respect to his
    failure to boot.
     
  5. PeterD

    PeterD Guest

    Easy to explain: the notebook has a (large) capacitor that is across
    the backup battery so that when that battery is replaced, the settings
    are not lost. He removes the backup battery, then in the (couple of
    weeks) time the capacitor finally discharges and the configuration
    settings are lost, and the computer can reboot.

    Many of these (not all!) have a jumper somewhere that will short that
    capacitor to give the same effect.

    Above reply does make assumptions as to what teh OP is doing, however.
    <g>
     
  6. I don't get it; how would the settings not being lost lead to the
    computer not being bootable? This would seem to defeat the whole purpose
    of nonvolatile configuration settings, unless I'm missing something
    obvious in your reply.


    --
    Made From Pears: Pretty good chance that the product is at least
    mostly pears.
    Made With Pears: Pretty good chance that pears will be detectable in
    the product.
    Contains Pears: One pear seed per multiple tons of product.

    (with apologies to Dorothy L. Sayers)
     
  7. PeterD

    PeterD Guest

    Corrupted hard drive data... I've seen it happen where it would only
    boot if the computer NVRAM data was set to factory specs (telling the
    BIOS to find out what the drive is). Very rare... But then again, the
    OP's problem seems a bit unusual, too! <g>
     
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