Hello, plz can you help me i switch the netbook on and it says no bootable device insert boot disk and press any key, i dont understand as there is no disk drive
The 'disk drive' would be your hard disk drive. There is a problem there it seems.
It could be damaged, or the operating system could be messed up, or as jasont78 mentions the HDD might have come loose from it's connector.
A couple things you can do.
Get an external USB adapter for 2.5" HDD and put the hard disk in that.
You can attach it another PC or Laptop by USB port and rescue any data or personal files off the hard disk - as long as the hard disk is working.
You can create a bootable RescueCD - but on a USB thumb drive.
You boot off the USB thumb drive and if the hard disk is still useable you can navigate and find your files on the HDD.