Laptop will not boot unless CMOS battery removed

January 30, 2015 at 08:03:44
Specs: Windows 7
I have an HP G50 laptop. I just put a new CMOS battery in. I am using the laptop charger to power unit. When i press power, I get nothing. I remove battery, unplug, then discharge motherboard. Without battery, I plug in, the the BIOS comes up, I set clock, then save, then it boots fine into Windows. Also, when I close lid, it will stay on even though settings are correct. If I shut down, the laptop is dead again unless I discharge motherboard.

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#1
January 30, 2015 at 08:08:00
Assuming the CMOS battery is connected properly, including polarity, it makes me wonder if the new battery is faulty. It would be unusual but I suppose it could happen.

Always pop back and let us know the outcome - thanks


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#2
January 30, 2015 at 08:13:22
I tested the battery with a volt meter and it checks OK. I am thinking something, like the BIOS chip set may be bad. I also flash updated off HP website

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#3
January 30, 2015 at 08:17:56
You are probably right about the voltage, although even a poor battery can often read full voltage when it is off load.

What's the background to this? What was the issue that lead you to changing the battery? Was the BIOS flash before or after you ran into the reported problem?

Always pop back and let us know the outcome - thanks


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Related Solutions

#4
January 30, 2015 at 08:22:18
The computer was completely dead when I turned on power and got nothing except power light when charger was connected.The memory checks fine. The problem existed before I flashed. I flash memory when Windows was running and it installed fine.

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#5
January 30, 2015 at 08:40:40
I wonder if I've got the order of events right. I've assumed it was originally running OK with Windows and at that stage you flashed BIOS and it was still OK. At some later stage it completely died, and what you described in the original post is what you have been trying in order to fix it.

"I remove battery, unplug, then discharge motherboard".
Presumably you did this with the main battery removed and the CMOS battery in place - looks like that is what you are saying.

In which case I think your idea of it being a motherboard component seems about right. However, it is an unusual symptom so keep watching for any other ideas.

Always pop back and let us know the outcome - thanks


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#6
January 30, 2015 at 08:47:25
No to first paragraph. Just one day, it would not turn on. So I removed devices one at time to isolate issue, like main battery, CMOS battery memory etc. Like I said, I was able to get in Windows fine, but have clear CMOS of energy with CMOS battery removed then set clock etc. If I then shut down normally, leaving power connected , install CMOS battery, then I am dead again.

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#7
January 30, 2015 at 08:57:50
I know it sounds like the same as you've tried but, if you haven't already done it exactly like this:

Turn off the laptop. Leave the CMOS battery in place. Disconnect from power. Remove main laptop battery. Hold Power Off/On button down for at least 20 seconds.
If it is still the same on re-assembly then I'm back to the last line of my #5.

Always pop back and let us know the outcome - thanks


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#8
January 30, 2015 at 09:03:45
Are you positive you have the CMOS battery installed with the correct side facing up? It sounds like that is NOT the case.

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