Romina not sure if you tried to check this out Sony Cybershot DSC-W5 Troubleshooting and see if any of it will work for you. Sometimes shaking the camera while pressing the power button or giving it a good whack on the side can solve the problem. here is also a good guide Sony Cyber-shot DSC-W5 Lens Replacement for the lens itself. Let us know how it is working out. Good Luck.