Having trouble with Windows 10 and my HP Pavilion dv5-1000us. I had both Windows 7 and Linux Mint on this laptop and it worked with no problem. I just tried installing Windows 10 on it and when it finished installing and restarted to complete the install, it got to the HP logo startup screen, where you can press Esc. for more options, and just freezes there. I also decided to take the hard drive out to see if it would start without freezing, which worked without any issues. I then decided to put the hard drive in a docking station and run it from there, which also worked, loading Windows 10 with no issues.
If you need anymore information, just let me know and I'll be sure to get it to you as soon as I can.