Question Computer shutdown after a while after CMOS change battery

[Lecquio]

I have an old dual core computer showing CMOS battery error on boot, and showing wrong date in Windows, so I take a new battery and change it.
After that, PC shuts down after a short while, sometimes it doesn't even reach Windows boot.
I tried a couple of different batterys, even the old one, and without any battery, and the problem remains. This never happened before.
What could be the problem?

 

[ravin_29]

May be it's just a coincidence that you might be having a bad PSU now and it just happened around the time you changed the CMOS battery.

 

[Lecquio]

It should be overheating, after changing CPU thermal paste it doesn't shutdown anymore.

 

[ravin_29]

Basically what I meant is CMOS battery had nothing to do with pc shutting down. It's mere coincidence. As you figured out old thermal paste was the issue not CMOS battery.