Hello Antonius. Welcome to the Forum.
When you are in the BIOS, is the hard drive and/or CD drive recognized there?
Try removing the battery and running it on the power supply only.
Did this unit suffer a fall or other "event"?
Are you comfortable with taking the unit apart? If so, you could remove and replace the drives. Check the contacts and blow out the dust, reconnect and try again. If you are uncomfortable bring it to a shop.
Unfortunately if the drives are not recognized in the BIOS and are connected properly then that strongly indicates a motherboard failure - the SATA controller chip most likely - and the cost of replacement approaches half the cost of a new laptop.