As I said, I deleted everything and I only can access the bios. I've tried with a booteable USB, follow all the instructions and in the end ask me to install again. Don´t know what to do, I' think that I have to format the disk but cannot do it from the BIOS and I'm not able to get to cmd. I also get error 3f0
If you are really using Windows 7, as you posted, then it will be more difficult. Also the error 3f0 could just mean the OS is gone and it needs to be reinstalled. If you get a screen that gives you a choice
Run the F2 to verify the hard drive is OK.
You might be able to find the reinstall software here
Be alert for scammers posting fake support phone numbers and/or email addresses on the community. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".