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Posted on Jan 02, 2017
Had the same problem with My Compaq M700 No Boot Or Post. Battery Light Flashes 8 Times, Have to Wait 24 to 48 hrs sometimes longer to get Laptop to Start. Tryed the DC Converter Board Change No Difference same Problem. Noticed When Laptop Did Start Clock Time Was always a Little Off 2-4 Hours sometimes more. So Figure CMOS Problem With Time Issues. Read About Battery Memory Transitor Voltage spike Detection Issues Corrected With Newer Bios Flash at HP Supports. So I Flashed Bios With Latest 686h. During the First Boot After Reflash Battery LED Did flash No Start, After pushing the power button again it Started. And has Every since.So Far Laptop Now Boots Everytime and CMOS Checksum Seems To Keep Time Correct In Windows. The Bios Flash Corrects a Voltage Spike Detecting Transistor In The Charging Circuit. During First Start after flash Bios will run system test on the charging system and Correct CMOS. Worked for Me Hope this Helps a Few.
Posted on May 30, 2008
SOURCE: HP Compaq nc6120 Fails to Boot
Here's a link to troubleshoot the startup of your notebook, from the HP online support site, and another link that explains how to reseat the ram, which is worth a try. Has it exhibited any unusual symptoms, blue screens, etc. recently? It sounds like either some kind of hardware conflict, or a bad power supply.
Unfortunately, the nc6120 has its internal power supply on the system board and can't be changed separately. The part #s and removal/replacement instructions are in the service manual, link here. This is a somewhat widespread issue, and if you're still covered by warranty, I recommend you get it in for service. Otherwise, you or a reliable tech could start selectively unplugging hardware and see if that is indeed the problem. See links to similar posts here.
Best of luck with it. I hate to be the bearer of bad news, but have it checked out before you buy a new board.
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Posted on May 20, 2009
i think is your bios battery(it is found on your board i dont know the type of system that you are using but just check for the silver battery and change it
Posted on Feb 08, 2010
Laptops are so integrated that usually a system failure that involves power issues such as in your case where you cant get it turn on with anything on the screen mean the mainboard (motherboard) is damaged. This usually leads to buying a new laptop or paying for the board to be replaced which usually costs as much as the laptop.
Posted on May 12, 2011
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