Try the following in case it is a corrupted BIOS that is causing the problem.
* Disconnect the charger (if connected) and open the laptop and remove the ''main battery'' from the laptop
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* Next disconnect the ''RTC (Real Time Clock) battery'' from the motherboard. Here's the [link|http://h10032.www1.hp.com/ctg/Manual/c06481638.pdf|service manual] for the laptop. Go to p.36 and p.58 to view the procedure to disconnect the main battery and the RTC battery respectively. ''Note:'' If you have a DMM (digital multimeter) measure the RTC battery voltage once you have disconnected and removed it from the laptop. If it is <2.5VDC replace it. Search online for ''L02772-001'' to get results for suppliers that suit you best
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* Next disconnect the ''RTC (Real Time Clock) battery'' from the motherboard. Here's the [link|http://h10032.www1.hp.com/ctg/Manual/c06481638.pdf|maintenance and service guide] for the laptop. Go to p.36 and p.58 to view the procedure to disconnect the main battery and the RTC battery respectively. ''Note:'' If you have a DMM (digital multimeter) measure the RTC battery voltage once you have disconnected and removed it from the laptop. If it is <2.5VDC replace it. Search online for ''L02772-001'' to get results for suppliers that suit you best
* ''Press and hold the laptop's Power On button for a full 30 seconds and then release it.'' Doing this will cause the BIOS settings to restore back to their factory default settings.
* Reconnect the RTC battery to the motherboard, reconnect the main battery and reassemble the laptop, connect the charger and try starting the laptop.
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Sometimes when the laptop is turned on again after having done the reset, there may be a message saying that the date and time are incorrect. This is normal as the BIOS has been reset. Once you correct the date and time the message won't appear the next time it is started. Also if you have changed any user definable settings in BIOS to suit your particular operating requirements they will have to be changed again to what you had as they will be reset back to their default setting.
Hi @saltyc
Try the following in case it is a corrupted BIOS that is causing the problem.
* Disconnect the charger (if connected) and open the laptop and remove the ''main battery'' from the laptop
* Next disconnect the ''RTC (Real Time Clock) battery'' from the motherboard. Here's the [link|http://h10032.www1.hp.com/ctg/Manual/c06481638.pdf|service manual] for the laptop. Go to p.36 and p.58 to view the procedure to disconnect the main battery and the RTC battery respectively. ''Note:'' If you have a DMM (digital multimeter) measure the RTC battery voltage once you have disconnected and removed it from the laptop. If it is <2.5VDC replace it. Search online for ''L02772-001'' to get results for suppliers that suit you best
* ''Press and hold the laptop's Power On button for a full 30 seconds and then release it.'' Doing this will cause the BIOS settings to restore back to their factory default settings.
* Reconnect the RTC battery to the motherboard, reconnect the main battery and reassemble the laptop, connect the charger and try starting the laptop.
Sometimes when the laptop is turned on again after having done the reset, there may be a message saying that the date and time are incorrect. This is normal as the BIOS has been reset. Once you correct the date and time the message won't appear the next time it is started. Also if you have changed any user definable settings in BIOS to suit your particular operating requirements they will have to be changed again to what you had as they will be reset back to their default setting.