Pavilion dv7-4285dx: cannot BOOT/POST to external VGA and internal LCD is dead (cracked)

I have cracked the screen of my HP Pavilion dv7-4285dx so badly that I cannot read anything on it. I am trying to boot to an external monitor on VGA port, but never get a signal.
I have tried the monitor switching key, but that doesn't do anything. I have tried disconnecting the internal LCD from the motherboard - no different. I have tried a CMOS reset by removing the laptop battery, removing CMOS battery, disconnecting power supply and holding power button down for >1 minute, then restarting with just external LCD attached, but STILL no video on VGA port.
The video adapter is okay, as it boots to Windows and then I have video on the external monitor.
Although it's good that I can use the ext. monitor once Windows boots, I need to have video at boot time to make changes to BIOS.
Does anyone have another suggestion of how I can get the BIOS to detect and display to external VGA at boot time?

Hello Todd_in_LA,
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.
I have read your post on how you are attempting to boot to an external monitor, and I would be happy to guide you towards a resolution!
Based on the information provided in your post, I recommend contacting our technical support at 1-800-474-6836. If you live outside the US/Canada Region please click the link below to get the support number for your region.
http://www.hp.com/cgi-bin/hpsupport/index.pl
I hope this helps!
Regards
MechPilot
I work on behalf of HP
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This question was solved.
View Solution.

Hi,
Please try:
Disconnect AC (Charger),
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Shutdown the machine,
Remove battery,
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Reboot the machine,
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Insert battery,
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Reboot the machine.
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**Click the KUDOS thumb up on the left to say 'Thanks'**
Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.

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Pavilion dv7-4285dx: cannot BOOT/POST to external VGA and internal LCD is dead (cracked)

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