don't know what happened to it but I can't find a systems disk. I have 4 recovery disks and that's all
If you have the recovery disks, then you can use these disks in order to reinstall the system.
Usually you should put the 1st disk into the CD/DVD drive and should boot from the CD. Then follow the instruction on the screen.
But if this would not be possible, then you should check the HDD.
Possible something happened to the HDD and therefore the notebook cannot boot the system. Using a 3rd party tool called Drive Fitness Test would help you to test the HDD.