Pavilion dv7-4051nv will not post, no display abd blinking caps lock button

I am working on this laptop that was working fine last week. Now it will not display, no post beep and the caps lock button blinks constantly every 3 seconds. What can I check?
Thanks

Hi
Try a hard reset,
Disconnect all external devices first.
Remove power cord and battery
Press power button for 30 seconds
Reinstall only power cord for first startup.
Power on
If no response
Try to Enter BIOS setup by tapping/holding the F10 key immediately after powering on the laptop.
Use Diagnostics to test your hdd - extensive.
If you cannot get the system to power on,
Manual: http://h10032.www1.hp.com/ctg/Manual/c02642701.pdf
Try reseating the hard drive by disconnecting & reconnecting SATA cable gently & firmly
Try reseating memory module
Power on & check
This document will help you troubleshooting the blink codes you're getting: http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c01732674
If not resolved yet, contact HP, may be a major hardware issue or a board problem: http://www8.hp.com/us/en/contact-hp/ww-contact-us.html
Thanks,
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Hello, @gman8a
Welcome to the HP Forums.
With the issue and what you've replaced already, I would recommend contacting phone support for assistance with this.
Please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
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Below lists the details of blink code. And you can visit the below site for more details
Caps Lock/Num Lock LED Component Tested Error Condition
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BIOS
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Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
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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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Hi there,
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Please click the "Kudos, Thumbs Up" at the bottom of this post if you want to say "Thanks" for helping!
Please click "Accept as Solution" if you feel my post solved your issue, it will help others find the solution.
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Pavilion dv7-4051nv will not post, no display abd blinking caps lock button

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