Black Display on POST
HP Pavilion dv6 Notebook PC
Board Born On Date
System boot manager:
GNU GRUB ver 2.0.4
It is used since many years ago.
OS : UBUNTU and Windows 7
System boot manager and OS last installation date : 2020-02-28
System hardware configuration last change year : 2017
All hardware components including external monitor which is attached via VGA cable are working propertly with same config from some years ago.
1- After plugin power, system will be booted without pressing power button. This issue raised since about 1 year ago.
2- Sometimes system started to type letters randomly and did not get my input using keyboard and mouse. This issue raised since about 1 month ago.
3- Found issue on scanning operation. This issue raised since about 1 month ago.
4- After booting, no display in POST. This issue raised since about 1 month ago.
I think all above problems are input-output issues so BIOS is source of issues. I replaced CMOS battery 1 month ago and issues numbered 1,2,3 solved but isuue numbered 4 is not solved. I try some boots to have booted system successfully.
I checked replaced CMOS battery, it was less than 2 vol and I checked new battery after 1 week use, it was about 3.2 vol, so new battery is OK.
But what to do to solve remained issue (no display in POST) which occures sometimes?
After replacing CMOS battery, I updated BIOS to version F.2D.
But no display in POST issue is not solved and ocuures sometimes and I must do some boot try to have booted up system finally.
What should I do to solve the issue?