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Machine Starts Only after CMOS battery removed and replaced

Hi;

I have a new Lenovo machine which we tried to use an additional video card in. After trying we realised that the power requirements of the card were too high for the power supply. When we reinstalled the original card it stopped powering up.

An identical working power supply was used to check it did not start. I have now discovered that it powers on when the CMOS battery is removed, it may continue to power on once or twice after the battery is put back in but then the process has to be repeated all over again.

Any ideas on the reason for this.
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Robert Saylor
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I have changed the battery but the same result.
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ASKER

Yes I cleared the CMOS. I have taken the board out again to check if it is touching but it is not. It only comes on regularly when the battery is out.
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dbrunton
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Hi Nobus; will try the update. Considered the overload option but find it interested that it is manifested in this way i.e. not starting when the battery is in.
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I have tried all of these and they did not work so it definitely seems like the MB.
i have had a case where the cpu had a bad contact -  it went from fully working to nothing at all - no boot - no fans
removing &replacing the cpu cured it