HP laptop cannot boot

I have a big concern. My HP laptop cannot boot any more. The options with F8 lead nowhere. It is the premium edition. Since I have over 100 GB of data, I don't want to format the drive.

Do anyone have the solution?

Try to do a system repair through the CD and check if it works.

Sorry for not adding this thing but I had already tried that but it didn't solved the issue. I have also tried knoppix, but it did not started and gives me the error message: "Can not find KNOPPIX filesystem."

Test with some Linux Distribution live CD such as Ubuntu. Logically it does not require your hard disk to get started.

OK, tried that. The test in the bios tells me to replace my hard disk drive. So I think my disk drive has died. Is it correct?

I wonder if that is your hard disk that has a problem! Because as I said in my previous post a live linux cd does not need a hard disk to start! It will only store! And in your case I think more of a concern is the ram! Because everything goes through the ram!

It was launched with a live cd, but there was a concern at the level of access rights. I could not recover. And a 160 GB hard disk, there were about a half.

I also checked in the bios:
memory test ok
Test drive to replace

Too cool in fact. I had used it just two months

first , like was mentioned, ram. Download memtest and boot from cd. It will let you know if it is a memory issue.
Memory can do funny things.....good to rule it out first.
I have seen so many times that software reports "good" or "bad" harddrive. I don't trust software to check drives at all. Laptops are banged around so much that a connections could have come loose- I have fixed several with this issue.
Be patient....check things in an orderly way to find out IF it really is the harddrive. You don't want to loose all the data?....rule out all other possible things first.