Compaq laptop won't power on

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I have an old Compaq Prosignia laptop, and I'm having trouble getting it to
power on.

After some Google searching I discovered that if I unplug the power and
battery, and hold the power button down for a minute, it will "restart" the
system.  And after plugging in the a/c cord, it powers on and boots up just
fine (this doesn't work with just the battery).  However, after shutting
down and unplugging the a/c power, I have to do this all over again.

Doing this reset the clock, so I thought it was the CMOS battery that needed
replacing.  I replaced it but it still does the same thing.

The battery pack is at 100% and it will power the laptop when it's already

Any ideas on what I can do?


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