What should I do my laptop? It stock on the screen with this _ after HP sign

[Kenn28]

After the HP invent pop my laptop stock up to black page where in there a underscore _ blinking and there’s nothing happen.

[WAWood]

@Kenn28 

Sorry, but that clearly indicates that the Windows boot loader could not find the OS -- and that almost always indicates a failing drive -- which is very likely to be the case if this DV6 still has its original drive.

If your PC is new enough to support UEFI, you can use these steps to test the hard drive: http://support.hp.com/us-en/document/c00439024

If not, to check the drive you have to follow these steps:
1) Press Esc key repeatedly, several times a second, while rebooting the laptop. Do NOT hold the key down, just press it over and over.
2) Eventually, you will see an HP Startup Menu
3) Press the Function key for testing the hard drive (usually F2) and let it run.
If the drive checks out OK, then report that and I can provide you options for reinstalling Windows on your PC.