The issue can often be resolved without needing to take it in for repairs. As a blinking "Caps Lock" key typically means that there is a power-related issue which your laptop already had issues with battery. In your case, you may be attempting to replace your battery and see if the problem disappearing.
Regarding your concern, you can [http://www.hard-disk-recovery.net/hard-disk-recovery-windows/recover-file-from-a-dead-computer.html|get your files back from a dead computer] without data leakage.