MYSTERY Compaq Laptop is "Alive" Again!!!


It's "alive" again (second time)! After a few months of storage (RTC/CMOS battery removed), I hooked it up and it boots up!!! This is the second time this Compaq Presario 1200XL needed a long rest before coming back to "life"!!!! NOTE: When it "dies", it will not boot up a few days to a week afterwards. I had tried this procedure both times, but this "mystery" laptop needs a long "rest" before it can be brought back to "life"!.

I "flashed" the BIOS via SP15611.EXE Rom Paq downloaded from I installed a new RTC battery, but I will keep the main battery removed. NOTE: The first time it "died", the main battery was installed. The second time it "died", the main battery wasn't installed.

I will no longer use this "mystery" laptop for anything important on the chance it will "die" again.


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- - - - - - - - - - - - - - - - Previous Post(s) from the past:

I found hundreds of postings regarding the Presario 1200XL series laptop with the same or similar problem as I have (see my original post below).

It is my impression that one common cause of this problem is the flash bios going bad. It seems that somehow, there is a connection with a dead RTC/CMOS battery and flash bios!!! I replaced my dead RTC/CMOS battery (like many others did), but that isn't enough.

I read several reports that stated the laptop was brought back to life after the flash bios was replaced, along with a new RTC/CMOS battery.

My impression is the 1200XL series is a LEMON or this was designed into the system so the laptop last for as long as the RTC/CMOS battery?


Hi, > > My Compaq Presario 1200XL laptop/notebook won't power up (dead). > > Note: I service TVs, etc. but not computers except my own. > > I checked the power micro switch (AOK). I removed the >battery, then tried to power it up again the next day without >installing the battery. Also, I used a bench power supply set >at 19Vs as a sub for the AC adapter with the same results. >I checked the 5 amp fuse on the mother board. > > When I press the power button/switch, there is absolutely no sign >of a response (reason I checked micro switch). > > The only indicator that lights is the one that shows the AC adapter >is plugged in. > > If I could get my hands on a schematic, that will be a big help. > > Thanks in advance, Brad >
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If you don't have to use it as a portable, leave it plugged in.

I've had similar (though not exactly identical) problems with a ThinkPad

760D. The "dying" might be the computer trying to go into sleep or power-down mode. Have you checked the settings? (You might have accidentally changed the "Power schemes". It's all-too-easy to do.)

If that doesn't resolve the issue, make a note of the BIOS settings, then replace the CMOS backup battery.

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William Sommerwerck

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