Computer won't start aftr CMOS battery change

May 16, 2018
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After the CMOS battery change ( I waited over 5 mins) the PC would not start. What it does do is, when I
turn the power supply back on, the pc immediately starts, then shuts back down in about 5 seconds. Pressing the power button does nothing. So if I shut the power supply off again, wait until all power is out of system then turn supply back on, it will start up, then shut down.
I checked all connections, and can't figure it out.
This system was running fine just prior.
Thanks, Bob