When I turn power button on lens retracts, it then

This is a relatively common problem with all retractable lens camera's. Most of the time the problem is that sand , dirt and grit gets lodged in the camera lens barrel thus keeping it from extending properly.

There are some DIY fixes you could try but use these at own risk as it may further damage the camera.

Firstly , try connecting your ac adapter or usb cable. The logic here is that it will provide more power to the lens extension mechanism which could possibly then overcome the particles lodged in the barrel.

Try holding the shutter button while switching on the camera.

Try using compressed air (best is a clean air can bought at a electronics store) and blow between the lens and the casing. This should help dislodge some of the particles.

Then, there is always the option of simply gently pulling the lens when it tries to extend but this is really risky and not always a feasible option.

Other than that , I would take the camera to a repair center for a evaluation to see if it would cost more to repair than to replace the camera. It will probably end up being cheeper to bin it and get a new one if these DIY tricks don't work.

Hope the advise works and please tell me how it goes.