Question PC only power on (no display) only when I remove CMOS battery

Mar 29, 2020
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I have an old pc (mb giga , ddr2 ram , 512mb gpu )
It doesnt turn on so i changed power supply
the first power supply I test result : cpu fan and gpu fan turns on immediately after power on power supply (not clicking power button) but no display.
I changed power supply
second power supply results : I should remove CMOS battery then It powers on when I click power button but no display the power button doesnt work to power it off
and its like a dead PC with CMOS battery

NOTE: RAM tested , gpu tested , cpu tested and second power supply is now working on another PC
 

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