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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