Boot-up/Black screen

Help me please
I’m working on this HP Pavilion g7, windows 8.1 laptop
The laptop is powered on but won’t boot up; I have got this error messages
Boot device not found please Install an operating system on your hard disk. Hard Disk (3F0)
For more information, please visit: www.hp.\go\techcenter\startup
I did a Hard drive and Memory test result passed.
I could handle the boot up issue but whenever I powered on the laptop with a recovery disk or a USB, as soon as windows about to load the screen go’s black but the laptop still on with the fan runing, and I tried to used an external monitor (Fn+f4) and no action on the external monitor and the laptop both are black,
My question; is it a video chip gone bad, if so the Motherboard need to be replace?
Help help help please. Thank you. HP Pavilion g7 2251dx D0M25UA#ABA: OS, WINDOWS 8.1 4GB

Hello @Famajeur ,
Welcome to the HP Forums.
I understand the computer is unable to detect a boot device. I will do my best to assist you.
To troubleshoot the issue, HP released a document on this hardware error. If you try these steps, you may be able to resolve the boot device error: Resolve Boot Device not Found Error Message
I believe these steps will resolve the issue. Unfortunately, the computer should be serviced if the issue is not resolved. To do this, please contact HP phone support. You can utilize this website to learn how to contact HP appropriately, based on your region: Contact HP Worldwide
Mario
I worked on behalf of HP.

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