CQ62-209wm turns on but does not boot stays on black screen

This same question was asked in 2013 but was never marked answer found. The suggested answer was to run the diagnostic tests on the hard drive and memory. My laptop has the exact same problem and I did perform the tests. Everything passed with no problem. I finally decided that the video had gone out hence I had a bad motherboard. Well I ordered a new motherboard, new battery, and new memory. I pulled the heat sinks cleaned the CPU, cleaned the fan and cooling fins, then replaced everything. Guess what folks it is still doing the same thing as before with all these new parts. No beep codes are generated, no sounds etc. What does happen is the Caps Lock light flashes about every 3 seconds and the WiFi symbol light stays orange. It never blinks. I found the light codes page accidently but there is no corosponding pattern between the light codes and the blinking cap lock key. It will just sit there and blink as long as you will let it or until the battery goes dead which ever comes first. This same problem has been around for years as I have found a multitude of posts concerning it and it is not just this one model. Forums everywhere have this posted on them.
So how about it HP engineers. Are there any of you willing to take on this problem and tell us how to fix it once and for all? I am tired of having a computer that only works when it wants too. I want both of my CQ62-209wm laptops to work. I am able to get the laptops to boot completely about 35% of the time. In order to make them work I remove the battery, plug in the power supply, replace the battery and then try to start it. Sometimes it works majority of the time it doesn't. I am beginning to suspect a possible problem in the power circuit because this is the first laptop I have ever used or owned that would not power on if there was no battery installed.
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I have brought your issue to the attention of an appropriate team within HP. They will likely request information from you in order to look up your case details or product serial number. Please look for a private message from an identified HP contact. Additionally, keep in mind not to publicly post serial numbers and case details.
If you are unfamiliar with how the Forum's private message capability works, this post has instructions.
MechPilot
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US support link to contact options for HP products purchased in the US.
Outside of US support link to contact options for HP products purchased outside the US.
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Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
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I work on behalf of HP
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MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

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7: cp /Volumes/usb/SecUpd2009-001Intel.dmg (this copies the files from the usb drive to the root drivel, at this point you no longer need the usb drive)
8: hdiutil mount /SecUpd2009-001Intel.dmg (this mounts the disk image)
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11: reboot
i hope this helps anyone looking to do this. Thanks again to those who helpes and all the other posts that had information that helped me identify and then fix my issue! I still love my mac.

CQ62-209wm turns on but does not boot stays on black screen

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