Hi,

Well it didn't last long, around 6 days, but this time it "died" while
I was downloading. I will not spend any more time trying to fix this
Compaq Presario 1200XL110. I removed the 3V RTC/CMOS battery,
which I bought new. I check the voltage (2.98V).

Brad


On Wed, 23 Apr 2008 11:42:24 GMT, in sci.electronics.repair you wrote:

Hi,

I have a Compaq Presario 1200XL110 laptop (bought 2nd hand) with
bad display (display "wires" disconnected). I used an external Monitor. I
kept the laptop plugged into AC all the time and the battery installed. I
had no problems the first few days. Note: the laptop was on from 7:30AM
until around 5PM every day. Then one morning, I tried to turn it on, but
absolutely nothing happened. The only indicator that was lit, which
is always lit, is the plugged into AC indicator. Note: I am a TV, etc. (not
computer) serviceman. I won't go into details of the tests I performed, which
included testing the power switch.
.
I removed a dead (!!) RTC/CMOS battery. Note: When the laptop "worked",
there was no sign (loss of time/date) that the RTC/CMOS battery was going bad.

I put this laptop in a box (main battery removed). About 5 days later, I
hooked it up to AC, but left the main battery out (RTC/CMOS battery removed).
When I tried to turn it on, absolutely nothing happened so I put it back in
the box (main battery removed).

Over a month later, I hooked up the laptop (main battery removed & no RTC
battery). When I pressed the power button, it booted up!!!!!!! I repeated
shut down and power up. It boots up every time, although I see a warning
message caused by no RTC/CMOS battery. I installed a new RTC/CMOS
battery. I now use it on AC without the main battery installed. When I shut
it down for the day, I remove AC power via the switch on the power strip.

Can someone explain this MYSTERY???

Thanks in advance, Brad

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